- Follow latest Royal baby updates on Tuesday here
- What it's like inside the private wing of St Mary's Hospital
- Everything we know so far after Duchess gives birth to boy
- Duchess emerged with Duke and baby just before 6pm Monday
- The Royal couple then drove home to Kensington Palace
- New Prince of Cambridge born at 11am weighing 8lbs 7oz
- Prince George and Princess Charlotte visited the newborn
- Arthur... Albert... Philip? Latest Royal baby name odds
- Champagne and cheers: Judith Woods outside the Lindo Wing
- How the Duchess's third baby changes the Royal family tree
The Duke and Duchess of Cambridge emerged full of smiles outside St Mary's Hospital as they proudly showed off their third child to the waiting world.
Just before 6pm on Monday, the Royal couple posed on the steps outside the central London hospital where international media and well-wishers had gathered to celebrate the Royal family's new arrival.
Wearing a red dress, the Duchess held her third child - a son who weighed 8lb 7oz - who could be seen wiggling his fingers.
The Royal couple posed for pictures with the Duchess holding her son who was nestled in a white blanket.
After waving at the cameras, they re-emerged with the baby Prince in a car seat being carried by his father and as he left, the duke told reporters he was "very happy, very delighted, thank you". He added: "Thrice the worry now."
He said: "We didn't keep you waiting too long this time." And when pressed on any clues for the name, Prince William said: "You'll find out soon enough."
Kensington Palace tweeted a picture of the couple with the caption: "Welcome to the family."
Welcome to the family. pic.twitter.com/nKSd5kh5bZ— Kensington Palace (@KensingtonRoyal) April 23, 2018
Prince George and Princess Charlotte arrived at St Mary's Hospital to meet their baby brother for the first time at 4.45pm before being whisked back home via a back exit.
In a statement, Kensington Palace said: "Their Royal Highnesses would like to thank all staff at the hospital for the care and treatment they have received.
"They would also like to thank everyone for their warm wishes."
On Monday afternoon, at 4.21pm, Prince William walked down the steps outside the central London hospital where the world's media and well-wishers had gathered to celebrate the Royal family's new arrival.
Half an hour after the Duke of Cambridge left the Lindo Wing after his wife gave birth, the now father-of-three returned with his two eldest.
Prince George, still wearing his school uniform, was the first to get out the Land Rover Discovery, which was driven by his father.
He was followed shortly afterwards by his sister Princess Charlotte, who waved to the cameras with one hand and held the Duke of Cambridge's hand with the other.
Hand-in-hand, all three walked up the steps into the hospital to meet the new arrival - but not before Princess Charlotte turned around once more to wave at the massive crowd outside.
He went back to Kensington Palace to check on the new Prince's older siblings - Prince George and Princess Charlotte - before bringing them back to the Paddington hospital to meet the newborn.
Prince William, wearing a shirt and a jacket, smiled as he left the hospital and drove himself in a Land Rover Discovery. He was heard telling the gathered crowd he would be "back in a minute".
The new Prince was born at 11.01am with Prince William alongside the Duchess, who had been taken to hospital having gone into labour at at 6am. Kensington Palace announced the new prince weighed 8lb 7oz.
The baby is fifth in line to the throne and the Queen and the Duke of Edinburgh's sixth great-grandchild.
Champagne corks popped and cheers rang out outside the Lindo Wing as the birth of a new Prince of Cambridge was announced at just after 1pm. The baby's sex was a surprise to William and Kate, who chose not to find out in advance.
Mother and baby are "doing well", while the Queen, Prince Philip and other senior members of the Royal family are said to be "delighted" with the news.
It is expected the prince's first name will be announced in the coming days, with predictions including Arthur, Albert, Frederick, James and Philip.
The Duchess was taken to the private Lindo Wing at St Mary's Hospital, in central London, before 6am on Monday in the early stages of labour, with the Duke of Cambridge at her side. Royal watchers had correctly predicted a swift delivery.
Video: Moment the Royal birth was announced
In a statement shortly after 1pm, Kensington Palace said: "Her Royal Highness the Duchess of Cambridge was safely delivered of a son at 1101hrs. The baby weighs 8lb 7oz. The Duke of Cambridge was present for the birth.
"The Queen, the Duke of Edinburgh, the Prince of Wales, the Duchess of Cornwall, Prince Harry and members of both families have been informed and are delighted with the news. Her Royal Highness and her child are both doing well."
Duke and Duchess of Cambridge introduce Royal baby to the world
As the day of the royal birth concludes Hannah Furness, our Royal correspondent takes in the day the new prince was introduced to the world:
The Duke of Cambridge was bursting with pride, the Duchess clearly besotted. And the third Cambridge baby? Fast asleep, but seemingly secure of his new place in the world.
The newborn Prince signalled his arrival with three tiny fingers as he made his public debut, fast asleep in the arms of his mother.
And while his newborn son was oblivious to the excitement he had caused, the Duke embarked on his new life with three children with no illusions, joking his enlarged brood would give him “thrice worry now”.
We take a look back at how the Duke and Duchess's young family has grown
Celebrities congratulate the royal couple
Holly Willoughby, Liam Payne and Ellen DeGeneres are among the celebrities who have sent their congratulations to the Duke and Duchess of Cambridge after the arrival of their third child.
TV star Willoughby posted a picture of the trio on Instagram and said they were "such a gorgeous family".
"Welcome to the world little prince," she said.
Congratulations to the Duke and Duchess of Cambridge ... welcome to the world little prince...… https://t.co/IiJe4wA1FX— Holly Willoughby (@hollywills) April 23, 2018
Liam Payne, who has a baby son with his partner Cheryl, tweeted: "Congratulations to her Royal Highness the Duchess of Cambridge Kate and the Duke of Cambridge, Prince William on the birth of their baby boy!"
Congratulations to her Royal Highness the Duchess of Cambridge Kate and the Duke of Cambridge, Prince William on the birth of their baby boy! #RoyalBaby ����— Liam (@LiamPayne) April 23, 2018
US talk show hots DeGeneres said: "It's a boy! Kate Middleton's new baby is now 5th in line to the throne, and season 43 of "The Crown."
"Congratulations to all!"
Comedian David Walliams quipped: "Prince Harry just got demoted again."
The blue floral dress worn by Princess Charlotte to meet her new baby brother
Princess Charlotte wore a £45 dress from a label founded by the Duchess of Cambridge's old friend as she smiled and waved to the crowds outside the hospital where she visited her new younger brother.
The Telegraph Fashion team have identified the dress as a Periwinkle dress from Little Alice London.
The design comes in periwinkle-printed cotton fabric, with puffed sleeves, blue daisy smocking and a white Peter Pan collar with coordinating piping.
Little Alice London, which specialises in 100% cotton smocked dresses and rompers, is owned by Alice Avenel, a friend of Catherine's from their time at Marlborough College.
Formerly Alice St John Webster, she married Gerald Avenel, a French banker, in 2012; the Duke and Duchess of Cambridge and Pippa Middleton attended the wedding.
A timeline of the day's events
Arthur the bookmakers' favourite for the prince's name
The baby son of the Duke and Duchess of Cambridge could be named after the mythical King Arthur - if punters are to believed.
Bookmakers have seen a flurry of bets placed on William and Kate's infant boy being given the moniker of the famous leader of the Knights of the Round Table.
William Hill's Rupert Adams said they had a very busy day with bets totally almost £100,000 placed by punters, with the 2-1 favourite Arthur and second place James 4-1, best backed.
Harry Aitkenhead from Coral said: "At the moment Arthur is now 7-4 with Coral. James 4-1 with Philip and Albert at 6-1 the only other two with single figure odds.
"Anything else would be a big surprise."
The moniker has a strong royal pedigree as it is one of the middle names of both Charles and William.
Arthur supposedly lived in the 5th or 6th century and is said to have unified the country and set up his court at Camelot before being killed in a final epic battle.
Once popular, the name fell out of fashion but has had a revival in recent years. Former prime minister David Cameron has a son called Arthur.
There were similar odds on offer at Paddy Power too, with a spokesman saying: “Kate and Will might be keeping tight-lipped in public, but we think enough people have ‘Arthur’ clue as to the name.
“Rumours have been swirling all day, and we’ve seen a royal flood of bets on Arthur, forcing us to pay out early.”
- Arthur (2/1)
- James (4/1)
- Albert (6/1)
- Philip (12/1)
- Michael (14/1)
- Jack (14/1)
- Edward (14/1)
- Louis (14/1)
- Henry (16/1)
- Thomas (16/1)
(Top 10 from Paddy Power)
The Duchess' 'Tea, Kate' who got her ready for the world's media
The Duchess of Cambridge faced having to appear in front of the world's media just hours after giving birth to her third child.
Kate and the Duke of Cambridge have traditionally introduced their newborns to the public with a brief photocall on the steps of the Lindo Wing, and they delivered again on Monday afternoon.
Here's a look at who from "Team Kate" was on hand to help the now mother-of-three prepare for the appearance with the Duke and their son.
Kate's PA turned style adviser Natasha Archer was spotted leaving the Lindo Wing early on in the day, possibly having delivered Kate's carefully selected outfit.
She was seen entering the Lindo Wing after the arrival of Prince George in 2013, carrying a car seat for the newborn future king and a dress bag.
Ms Archer has been credited with revamping the Duchess's look, and is said to be tasked with ordering clothes and ensuring any necessary bespoke adjustments are made.
She joins the Cambridges on their overseas tours and is believed to have previously worked for the Duke and Duchess of Gloucester.
Amanda Cook Tucker
Amanda Cook Tucker is responsible for caring for what the Duke of Cambridge once joked was Kate's "nightmare" hair.
She was called to the Lindo Wing to help prepare the Duchess's brunette locks after the birth of Prince George and Princess Charlotte.
This trusted member of Team Kate was said have been on standby for a month ahead of George's arrival.
She is well used to working with the royals - she has been cutting the hair of William and Harry for years.
Maria Teresa Turrion Borrallo
George and Charlotte's full-time live-in nanny Maria Teresa Turrion Borrallo was tasked with caring for the prince and princess, and preparing them for the visit to the hospital.
The indispensable Norland nanny has been with the family since 2014, joining them when George was eight months old.
Kate's private secretary is Catherine Quinn - the head of Oxford University's business school, while William's is Miguel Head.
The pair of top aides were tasked with keeping the royal offices running smoothly, rescheduling meetings and acting as gatekeepers to the royal couple.
Mr Head has been a trusted member of the Kensington Palace team and is leaving his post as private secretary in July.
A warm tribute was paid to Mr Head when his departure was announced, with William described as feeling "incredibly lucky to have benefited from Miguel's advice and support over the last decade".
Ms Quinn took over in October from Kate's former private secretary Rebecca Priestley, nee Deacon.
Jason Knauf, William and Kate's press spokesman, has visited the hospital, ready to arrange the photocall outside the Lindo Wing.
How will the Prince's birth impact the Royal Wedding?
The royal baby has arrived just over three and a half weeks before the royal wedding.
Prince Harry and Meghan Markle are due to tie the knot in Windsor in only 26 days' time on Saturday May 19.
The Duchess of Cambridge is expected to be attending but, with her baby son only a few weeks' old, she is not likely to stay for the entire celebration which will stretch into the evening and probably the early hours.
Her attendance is likely to depend on how she is feeling and how the baby is feeding.
When around one month old, the baby prince will be able to coo, gurgle and hum to express feelings, will have fully developed hearing and be able to focus a bit better but still only see around 30cm.
He may be able to hold his head up briefly but his neck muscles will still be weak.
Prince George and Princess Charlotte are tipped to be page boy and bridesmaid at the ceremony in St George's Chapel.
When the royal youngsters carried out the same duties for their aunt Pippa Middleton, Kate was on hand to guide them and keep them in line.
It is likely if Kate does attend, the baby will stay with the Cambridges' nanny Maria Teresa Turrion Borrallo.
The Duke of Cambridge is expected to be carrying out the role of Harry's best man.
Some 800 guests will gather in the gothic St George's Chapel to witness Harry wed American former actress Ms Markle, to whom he got engaged after a 16-month whirlwind romance after meeting on a blind date.
The Duchess of Cambridge's patriotic red and white dress
The Duchess of Cambridge opted for patriotic red and white - the colours of the England flag - as she made her first public appearance with her St George's Day baby.
Kate gave birth to her son - her third child - on the morning of April 23 - the feast day of St George, the patron Saint of England.
The duchess looked glowing as she cradled the new prince of Cambridge on the steps of the Lindo Wing, less than seven hours after giving birth.
Kate was dressed in a vibrant, block red Jenny Packham shift dress with an oversized, delicate white floral lace collar.
The prince, whose name has not yet been announced, wore white - wrapped in a lace shawl with a matching bonnet.
The flag of Saint George - a red cross on a white background - is the flag of England and is incorporated into the Union Flag.
St George, who lived in the third century, is heralded for his honour, bravery and gallantry.
Surrounded by myth, one legend tells of St George's slaying of a dragon.
White House press secretary Sarah Sanders offers congratulations 'mother to mother'
Sarah Sanders, the White House press secretary, said: "I want to congratulate the Duke and Duchess of Cambridge on the birth of their third child, a baby boy.
"And from one mother to another I know the reality of being outnumbered can be very scary but I know she and Prince William will continue to be amazing parents."
The Royal superfans who camped outside the Lindo Wing for 15 days
Our reporter Francesca Marshall has been on the ground in Paddington soaking up the atmosphere with Royal superfans.
Here's an update from her:
Across the UK people awaited news on the arrival of the newest member of the royal family.
But not many can say they camped out outside the hospital for 15 days just to catch a glimpse of The Duchess of Cambridge with her new child.
Princess Diana superfan John Loughrey, 63, from Streatham has waited at the Lindo Wing of St Mary's Hospital in Paddington for every one of The Duchess's births - but he said the wait for the latest arrival had been the longest of all.
"We've been here for 15 days and I'm ready to go home but it's been absolutely worth it.
"It's such an honour to be here and I'm so excited - I also came to see the births of George and Charlotte."
During the agonising two week wait Mr Loughrey and his fellow fans were provided with showers and porridge from the hospital, and also used their new spare time to run errands for patients.
He said: "The love we have gotten from patients and staff has been incredible.
"Everyday we have been given porridge and tea and coffee from staff and patients have come and spoken to us.
"And I've gone and run errands for patients to be of some help.
"We've also been able to shower in the hospital but getting home tonight I hope will be brilliant - 15 days is the longest I've waited for a royal baby to be born and I was beginning to wonder when it was going to happen."
The 63-year-old's love affair with the royal family began with Princess Diana, who he said today "is there is spirit for them, and for Kate, she went through this and knows how it feels."
He added: "I really can't put into words what being here means, it's just so special to me. And I want the Dutchess of Cambridge to know how proud her country is of her and thank her for all that she has done.
"My prediction was that it'd be a boy and I hope they call him Philip.
"I do bell ringing at my local church and on Tuesday I will be ringing the bells for them."
After being camped out for 15 days Mr Loughrey said he's heading for fish and chips for dinner, with champagne to raise a toast to the new Prince.
"It's been worth every minute spent here but now heading for food, drink and home for a good night's sleep," he said.
Though he has decided to leave his temporary sleeping quarters outside the hospital intact as it was a new record 15 days here."
The superfan added: "I have to say I don't think I've ever seen Catherine look so radiant and I already can't wait for the next royal baby and I'll absolutely be here again."
The Royal baby's tiny fingers could be seen moving
The tiny fingers of their son could be seen moving as the couple looked around smiling at the crowds.
The duchess wore a red Jenny Packham dress with a contrasting white collar.
They went inside for a few minutes to put their son in a baby carrier and emerged hand in hand.
The first picture of the Royal baby's face
Here is the first picture of the Royal baby's face.
The Royal baby makes his first appearance outside the hospital
The Duke and Duchess of Cambridge have introduced their baby boy to the world, standing proudly on the steps of the Lindo Wing with their son.
The royal infant, wrapped up against the cool Spring weather, nestled in the arms of his mother as the couple posed for pictures.
The Duchess looked in good health after giving birth this morning to her as yet un-named prince, who is fifth in line to the throne.
They appeared on the steps at the front of the private hospital with the Duchess wearing a red dress, before heading back inside.
The Duchess had initially held her newborn in her arms, but when they re-emerged to head back home to Kensington Palace, the baby was in a car seat and being held by his father Prince William.
Duchess of Cambridge leaves hospital with the new Prince
The Duchess of Cambridge has emerged from the Lindo Wing at St Mary's Hospital after giving birth to her third child.
Late on Monday afternoon, Kate Middleton posed on the steps outside the central London hospital where the world's media and well-wishers had gathered to celebrate the Royal family's new arrival.
Excited well-wishers celebrate the arrival of the new Prince
Well-wishers were very excited to see George and Charlotte arrive at hospital to visit their Mother and new baby brother.
One woman said: "I'm was visiting the hospital and couldn't believe that as I got here so did they.
"It was very exciting and brightened my day - it's probably also brightened a lot of other people's day who are visiting the hospital or working here."
Another added: "I was passing with my daughter after school and thought it would be lovely to see and it was very exciting."
Meanwhile over at Buckingham Palace, hundreds of royal well-wishers gathered at the gates as news of the new prince's arrival was announced in a tradition which stretches back to the 19th century.
The crowd waited patiently for the formal notice of the arrival of the fifth in line to the throne, which involves the presentation of a bulletin, placed on a golden easel in front of the palace.
In the crowd was Luigi Ritacca. He was celebrating his 31st birthday and said he felt happy to share the day with the new royal arrival.
"I'll never forget the date, that's for sure," he said. "Of course, it's stolen my thunder a little, but as long as they don't name him Luigi, I'll be fine," he added.
John and Susan Gill were having tea at the Ritz when they heard the news of the birth.
"A lady stood up and raised a glass of champagne and said: 'to the new prince," said Susan.
They then walked down to Buckingham Palace to soak in the atmosphere.
"This is what Britain is all about," added John. "The more the merrier."
Vicky and Mike Greenslade arrived at the palace as soon as they heard the news of the royal birth.
"It's a great atmosphere, and very well organised," said Mike. "It's very British," added the 71-year-old.
The easel is set to stand in front of the palace for 24 hours. When it is taken down, it is sent to the Privy Council Office so that the details of may be recorded in the Privy Council records, according to the palace.
Kenyans take to Twitter to celebrate the birth of the Royal baby
Kenyans took to Twitter to celebrate the birth of the royal baby, with the new arrival leading the trending in a country that has deeply cherished links with the House of Windsor.
Donald Kipkorir, one of Kenya's most prominent lawyers, tweeted: "As a fully-fledged supporter of the House of Windsor, I celebrate the #royalbaby as it guarantees the continuity of the Royal Family. May the good Lord watch over our royal Prince."
As a full-pledged Supporter Of the House of Windsor, I celebrate the #royalbaby as it guarantees the continuity of Royal Family. May the Good Lord watch over our Royal Prince.— Donald B Kipkorir (@DonaldBKipkorir) April 23, 2018
The Queen acceded to the throne while staying at Treetops Lodge in Kenya's Aberdare Moutains in 1952 after the death of her father, King George VI. Princess Margaret was a frequent visitor, while the Duke and Duchess of Cambridge were engaged on the slopes of Mt Kenya.
"May God save the queen, bless the House of Windsor, Britain and the Entire Commonwealth," wrote another Kenyan Twitter User, Political Ixion.
The news was also widely covered on Kenya's leading news websites.
CNN presenter suggests baby should be named after Harry Potter’s son
An update from our US Editor Ben Riley-Smith.
America’s cable news shows are getting suitably excited by the royal baby news, with reporters stationed outside the hospital doing regular down-the-line reports.
But one CNN presenter, John Berman, has got into hot water after merging the royal news with another British franchise success, Harry Potter.
Mr Berman suggested that the new royal baby should be named Severus Albus Windsor – an apparent ode to Harry Potter’s fictional son Albus Severus Potter.
JK Rowling picked up on the suggestion, tweeting that it had triggered “one of my regular out-of-body ‘how the hell did all this happen?’ moments”.
Mr Berman later joked his proposal had caused an international incident. He said the name would be “awesome” but conceded on Twitter: “I get my fairy tales mixed-up sometimes.”
Duchess of Cambridge to leave hospital tonight
Her Royal Highness The Duchess of Cambridge will be leaving St. Mary’s Hospital, Paddington, London this evening.
The Duke and Duchess of Cambridge and their son will travel home to Kensington Palace.
Prince George and Princess Charlotte have now returned to Kensington Palace.
Their Royal Highnesses would like to thank all staff at the hospital for the care and treatment they have received.
They would also like to thank everyone for their warm wishes.
Prince George arrives in his school uniform as Princess Charlotte waves at crowd
Prince George, still wearing his school uniform, was the first to get out the Land Rover Discovery, which was driven by his father.
He was followed shortly afterwards by Princess Charlotte, who waved to the cameras with one hand and held the Duke of Cambridge's hand with the other.
Hand-in-hand, all three walked up the steps into the hospital to meet the new arrival - but not before Princess Charlotte turned around once more to wave at the massive crowd outside.
Prince George and Princess Charlotte arrive to meet their brother
Prince George and Princess Charlotte have arrived at St Mary's Hospital to meet their baby brother for the first time.
Half an hour after the Duke of Cambridge left the Lindo Wing at after his wife gave birth to their third child, the now father-of-three returned with his two eldest.
On Monday afternoon, Prince William walked down the steps outside the central London hospital where the world's media and well-wishers had gathered to celebrate the Royal family's new arrival.
Jeremy Corbyn and Nicola Sturgeon congratulate the Duke and Duchess
Labour leader Jeremy Corbyn said: "Congratulations to Kate and William on the birth of their baby boy. I wish them all the very best."
Scottish First Minister Nicola Sturgeon took to social media to send her best wishes to the family.
She said on Twitter: "The birth of a new baby is a special and joyful time for any family - my congratulations and best wishes to William, Catherine and the new baby's (no doubt very excited) big brother and sister on this happy occasion."
Duke of Cambridge leaves the Lindo Wing
The Duke of Cambridge has left the Lindo Wing at St Mary's Hospital after his wife gave birth to their third child.
On Monday afternoon, Prince William walked down the steps outside the central London hospital where the world's media and well-wishers had gathered to celebrate the Royal family's new arrival.
It is understood he will head back to Kensington Palace to check on the new Prince's older siblings - Prince George and Princess Charlotte - with the plan being to bring them back to the Paddington hospital to meet the newborn.
Prince William, wearing a shirt and a jacket, smiled as he left the hospital and drove himself in a Land Rover Discovery.
He was heard telling the gathered crowd he would be "back in a minute".
The Duke of Cambridge departs St Mary’s Hospital to see Prince George and Princess Charlotte at Kensington Palace. pic.twitter.com/qOwD4uepgB— Kensington Palace (@KensingtonRoyal) April 23, 2018
Messages of congratulation from Canada and Israel
Justin Trudeau, the Canadian Prime Minister, has sent his congratulations to the Royal couple.
Prime Minister Justin Trudeau offers his congratulations to Their Royal Highnesses The Duke and Duchess of Cambridge on the birth of their third child. ���� ����— CanadianPM (@CanadianPM) April 23, 2018
And Reuven Rivlin, the President of Israel, sent his "warmest wishes" to the Royal family.
Mazal Tov! Congratulations to TRH the Duke & Duchess of Cambridge on the birth of their son #RoyalBaby. Together with Nechama, and all the Israeli people, I send warmest wishes to Her Majesty the Queen, & all the Royal Family. Looking forward to welcoming the Duke to Israel soon.— Reuven Rivlin (@PresidentRuvi) April 23, 2018
The Duke of Cambridge is visiting Israel sometime this summer, for the first official visit by a senior Royal since Israel's founding 70 years ago.
Duke of Cambridge expected to leave Lindo Wing soon
We are expecting Prince William, the Duke of Cambridge, to leave the Lindo Wing alone soon in the next hour.
It is thought that he will go to see Prince George and Princess Charlotte before possibly bringing them back to the hospital to visit their mother and meet their new brother, but that is not yet confirmed.
Britain's 'Loyalist Royalist' has prime spot outside Lindo Wing
Waiting in the growing crowd outside St Mary's Hospital for a glimpse of the new prince was Margaret Tyler, also known as Britain's Loyalist Royalist, reports Francesca Marshall.
Ms Tyler, 74, proudly has more than 10,000 items of Royal memorabilia in her north London home.
"I waited for George for six days and Charlotte for 11 but today I just timed spot on," she said. "I couldn't have been waiting here for days and days as I was outside the palace to celebrate Her Majesty's 92nd birthday."
She is possibly Britain’s largest collector of royal memorabilia. The Guinness Book of Records has asked her to start counting her items to find out for certain.
She has a prime spot outside the hospital and sported a full Union Jack checked suit.
Hearing the news of The Duchess giving birth to a baby boy, she said: "It's very exciting to be here and an incredible moment.
"This is such an exciting year for the Royals and I'm already preparing to be in Windsor next month [for the wedding of HRH Prince Harry and Ms Meghan Markle].
"Today really has filled me with happiness and pride for the royal family and our country and I send them my congratulations."
Union flags raised to mark Prince of Cambridge's birth
The Royal family's Twitter account posted a video of a Union flag raised to mark the birth of the Duke and Duchess of Cambridge's third child.
A large Union Flag has been raised over Buckingham Palace and a State Standard over Windsor Castle to mark the birth of The Duke and Duchess of Cambridge's third child. pic.twitter.com/hcYYluf2fF— The Royal Family (@RoyalFamily) April 23, 2018
'Delighted' Queen pictured horse riding days after 92nd birthday
The Queen, who celebrated her 92nd birthday two days ago, was pictured riding a horse in the grounds of Windsor Castle on Monday morning. She was later said to be "delighted" with the birth of her sixth great-grandchild.
Official announcement of Royal birth goes on display
The birth of the prince was announced formally to the world when a bulletin, printed with brief details about the birth, was placed on an easel erected in the forecourt of Buckingham Palace.
The bulletin - on foolscap-sized paper set in a dark wooden frame - was put into place by Royal footman Heather McDonald and and senior footman Olivia Smith at 2.30pm. It said the Duchess was "delivered" of a son and gave the time of birth as 11.01am.
The notice was signed by the senior medical team caring for the duchess including Guy Thorpe-Beeston, surgeon gynaecologist to the royal household, and consultant gynaecologist Alan Farthing, surgeon gynaecologist to the Queen. It will remain in place for around 24 hours.
The practice of posting a bulletin announcing a royal birth has gone on for at least as long as Buckingham Palace has been the Sovereign's official residence - since 1837.
After it comes down, the notice will be sent to the Privy Council Office so it can be kept in their records.
World congratulates Duke and Duchess on birth of son
Celebrities and politicians have been sending their best wishes to the Duke and Duchess of Cambridge on social media.
After Theresa May wished the couple "great happiness for the future", Mayor of London Sadiq Khan sent his "warmest congratulations".
On behalf of Londoners, I want to send our warmest congratulations to the Duke & Duchess of Cambridge on the birth of their baby boy. https://t.co/pigHuqJ8By— Sadiq Khan (@SadiqKhan) April 23, 2018
Foreign Secretary Boris Johnson offered his "huge congratulations to Their Royal Highnesses".
The University of St Andrews, where the Duke and Duchess met, dug out a picture from the archives.
Baby joy for Fife graduates - #congrats to Catherine Middleton, art history Class of 2005 & William Wales, geography Class of 2005, on the birth of their 3rd child. #RoyalBaby �� pic.twitter.com/v7VlJd6faR— Univ of St Andrews (@univofstandrews) April 23, 2018
The Archbishop of Canterbury, Justin Welby, said in a statement: "May God bless them and all of their children with love, happiness and health."
Congratulations to The Duke and Duchess of Cambridge on the safe delivery of their baby, a brother for Prince George and Princess Charlotte. May God bless them and all of their children with love, happiness and health.— Archbishop of Canterbury (@JustinWelby) April 23, 2018
Speaker John Bercow told the Commons: "I am sure the whole House would want to join me in sending Their Royal Highnesses, the Duke and Duchess of Cambridge, our warmest congratulations on the birth of their son."
Meanwhile, comedian David Walliams quipped: "Prince Harry just got demoted again."
Arthur, Albert and Philip all tipped for new prince's name
Arthur, Albert and Philip are all thought to be in the running for the new Royal baby's name.
As is tradition, the Duke and Duchess of Cambridge have not immediately announced the chosen name of their third child and second son. They are likely to wait until they have informed the Queen and the rest of their family.
Historian Judith Rowbotham predicted William and Kate would pick Philip for the new baby prince, in tribute to the Duke of Edinburgh.
"I strongly suspect that Philip will be either a first or a second name," she said. "It's plain that they like the Germanic sounding names but at the same time they're looking within the Windsor traditions."
Arthur has been the bookmakers' favourite for a boy, followed by Albert.
The medical team who looked after Duchess during labour
The senior medical team that looked after Kate during her labour were named by Kensington Palace, with Guy Thorpe-Beeston, surgeon gynaecologist to the royal household, and consultant gynaecologist Alan Farthing, surgeon gynaecologist to the Queen, joined by two familiar colleagues.
Dr Sunit Godambe, a consultant neonatologist at Imperial College NHS Trust, which runs St Mary's hospital, was part of the group that cared for the duchess during her previous two births alongside Mr Farthing and Mr Thorpe-Beeston.
Professor Huw Thomas, physician to the Queen and head of the medical household, completed the team. He was also involved with the birth of Princess Charlotte.
New Prince of Cambridge is Kate's heaviest baby yet
The new baby Prince of Cambridge weighed 8lb 7oz - heavier than both Prince George and Princess Charlotte. Charlotte, at 8lb 3oz, weighed slightly less than George's 8lb 6oz - but was still above average.
The average weight of a baby in the UK is around 7lb 7oz (3.5 kg). All three of the Duchess of Cambridge's children have weighed more than 8lbs.
But the new prince is not the heaviest royal baby in recent years. That title falls to Savannah Phillips - the daughter of the Queen's grandson Peter Phillips - who weighed 8lb 8oz in 2010.
George was the heaviest future king to be born in recent history. Prince William weighed 7lb 1.5oz in 1982, while Prince Charles weighed 7lb 6oz in 1948. Prince Harry weighed 6lb 14oz in 1984.
The Queen - then Princess Elizabeth - was born by Caesarean section in her maternal grandparents' London home and was also third in line to the throne at the time, but her weight was not announced, as was previously the custom for royal babies.
It's a boy! BT Tower and Royal Navy messages after Royal baby birth
As news of the Royal baby spreads around the world, messages of congratulation have been emerging far and wide.
It's a boy! @RoyalNavy sailors and @RoyalMarines on board @hms_albion have sent their best wishes and congratulations to @KensingtonRoyal with a special flight deck photograph from operations in the Asia Pacific region. #royalbabypic.twitter.com/THJV5mD0wn— Royal Navy (@RoyalNavy) April 23, 2018
Prime Minister offers 'warmest congratulations' to Royal couple
Theresa May, the Prime Minister, has led the messages of congratulation to the Royal couple, wishing them "great happiness for the future".
"My warmest congratulations to the Duke and Duchess of Cambridge on the birth of their baby boy. I wish them great happiness for the future." - PM @theresa_may— UK Prime Minister (@10DowningStreet) April 23, 2018
'God save the Queen': Town crier announces birth on steps of Lindo Wing
The self-proclaimed Royalist Town Crier has announced the birth of the baby prince on the steps of the Lindo Wing, marking the moment by saying "God save the Queen".
He drew cheers from the crowd of royal watchers outside the hospital.
New Royal baby born on St George's Day
The new royal baby has been born on patriotic St George's Day, which celebrates the patron saint of England, and arrived just two days after the Queen's 92nd birthday.
The baby also shares a birthday with Lady Gabriella Windsor, daughter of Prince and Princess Michael of Kent.
Lady Gabriella was also born in the Lindo Wing on April 23 in 1981, and is celebrating turning 37.
Duchess expected to head home in a few hours
The Duchess will be expected to head home to the sanctuary of Kensington Palace in a few hours, just as she did with Charlotte in 2015 - but not before introducing the new royal baby to world on the steps of the Lindo Wing.
George and Charlotte might even visit the hospital to see their mother and baby sibling, just as George did when his younger sister was born three years ago.
New Prince of Cambridge is fifth in line to throne
The new Prince of Cambridge is fifth in line to the throne and a younger sibling to Prince George and Princess Charlotte.
The new-born baby becomes the first in history not to leapfrog a female sibling in the line of succession, reports Robert Mendick.
Under the 2013 Succession to the Crown Act, the male-preference primogeniture was replaced with absolute primogeniture. The act meant any royal born after 28 October 2011 would precede his or her siblings, regardless of sex.
It means Princess Charlotte remains fourth in line to the throne with the new (male) baby at fifth in line. Prince Harry drops down to sixth in line.
Kensington Palace statement: 'Duchess of Cambridge has been delivered of a son'
Kensington Palace said in a statement: "Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 1101hrs.
"The baby weighs 8lbs 7oz. The Duke of Cambridge was present for the birth. The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, Prince Harry and members of both families have been informed and are delighted with the news. Her Royal Highness and her child are both doing well."
Breaking: It's a boy! Duchess of Cambridge gives birth to son
The Duchess of Cambridge has given birth to a son weighing 8lbs 7oz, Kensington Palace has announced.
Is announcement imminent? Duchess's stylist spotted leaving hospital
Natasha Archer, the Duchess's stylist and personal assistant, has been spotted leaving the St Mary's hospital complex.
Ms Archer was photographed walking from the Mary Stanford wing, a neighbour of the Lindo Wing where the Duchess was taken after going into labour.
Royal fans will be hoping this suggests an announcement is imminent.
Video: Royal fans in excited anticipation outside Lindo Wing
As the Great Kate Wait goes on, Royal supporters remain in buoyant mood outside the Lindo Wing. This video has the latest from the scene.
Will the Duke and Duchess take maternity and paternity leave?
They have on previous occasions: after the birth of Princess Charlotte, the Duke took two weeks' statutory paternity leave from his job as an air ambulance pilot, which he quit in July 2017 to become a full time royal, and the Duchess took maternity leave from her official royal duties.
After the birth of Prince George, the Duchess was back in action after five weeks, joining her husband to start the Anglesey Coastal Ultra Marathon. However, she maintained a light workload for several months after both births.
Duchess faced severe morning sickness again in pregnancy
Despite suffering from another bout of severe morning sickness, the Duchess of Cambridge battled through to carry out a significant number of engagements while pregnant.
Kate's pregnancy was announced on September 4 last year, after she was forced to cancel an appearance the same day due to the condition known as hyperemesis gravidarum.
At the start of all three of her pregnancies, Kate has suffered from the same problem. But unlike her first pregnancy, when she was admitted to hospital and treated for a number of days, the duchess did not need that level of care this time.
A few days after the announcement that she was expecting her third child, Kate missed Prince George's first day at school as she was too poorly to attend.
She made her first public appearance almost five weeks later, attending a mental health reception at Buckingham Palace with the Duke of Cambridge and Prince Harry.
Kate was well enough to make a surprise appearance at Paddington station in October, joining William and Harry at a charity event, where she danced on the platform with Paddington Bear.
And the following day Kensington Palace announced that the Cambridges' baby was due in April, interpreted as indicating the duchess's 12-week scan had taken place.
It is thought a number of Kate's engagements were postponed due to her illness, and in the new year she carried out a significant number as her baby bump became more prominent.
During January, Kate attended a string of official engagements and appeared to be back in good health, and at the end of the month she travelled with William to Norway and Sweden for an official visit.
Other high-profile events as her pregnancy developed and her baby bump grew included an away day to Sunderland, a Royal Foundation engagement with the duke, Prince Harry and Meghan Markle, and the launch of an expert panel to look at supporting the early years development of children.
Kate bowed out of official duties with a flourish, attending two Commonwealth events with her husband before her maternity leave began.
Aerial picture shows world's media outside Lindo Wing
The scene outside the Lindo Wing is one of chilly calm, reports Royal Correspondent Hannah Furness. In a cold wind, the world's media has assembled opposite the now-famous brown door of the hospital flanked by uniformed police officers.
Kensington Palace staff have marshalled the national print Press, broadcast media, photographers and members of the public into their respective pens, in a tried-and-tested system perfected after the births of Prince George and Princess Charlotte.
The world’s media are gathered outside the Lindo Wing at St Mary’s Hospital ahead of the birth of The Duke and Duchess of Cambridge’s third child. pic.twitter.com/FLr1lL2AyT— Kensington Palace (@KensingtonRoyal) April 23, 2018
The mood is one of calm anticipation, with reporters and royal admirers waiting for nature to take its course inside the hospital.
While some pass the time by guessing the sex and name of the third Baby Cambridge, no one has forgotten that at the centre of this is a woman, albeit a Duchess, in labour.
Prince William 'in denial' about having third child
It was always thought that William and Kate would go on to have three children. Kate is one of three and had a happy home life with her sister, Pippa Matthews, and brother, James Middleton, and is close to both of her siblings.
But William may need to adjust to caring for a newborn once again. Kate joked in the months leading up to her due date that her husband was "in denial" about having a third.
By having more than two children, William and Kate are following in the footsteps of the Queen and the Duke of Edinburgh, who went on to have four children - although there was a gap of 10 years between their second child, Anne, and third, Andrew.
New parents emerge from Lindo Wing to face world's media
An unsuspecting couple have emerged from the Lindo Wing with their newborn baby to be greeted by the world's media.
They posed for photographs outside the famous door in front of a larger crowd than they might have expected included dozens of journalists and photographers before leaving in a taxi.
Will he or she ever be monarch?
Unlikely. It's rare, but not unheard of, for a third-born royal in direct succession to become king or queen.
This Cambridge sibling will live their life happy in the knowledge they will not be expected to wear the crown, leaving that role to older brother George.
William IV, a Hanoverian king who ruled from 1830 to 1837, was a third child - of George III and Queen Charlotte. He acceded to the throne when he outlived his older brothers, George IV, who died without an heir, and Frederick, Duke of York.
How the third Royal baby will affect the succession
The new royal baby will be fifth in line to the throne, behind the Prince of Wales, the Duke of Cambridge, Prince George and Princess Charlotte. It means Prince Harry will drop down to sixth in line, and every other member of the Royal family will be one step further away from the throne.
Because of recent changes to the laws governing succession, the baby's sex will make no difference, as boys no longer have precedence over girls.
If the change had not been made and the third baby were a boy, he would be fifth in line instead of Princess Charlotte - however that will now not be the case.
The new baby will be an HRH and a Prince or Princess of Cambridge - thanks to the Queen who stepped in ahead of Prince George's birth to ensure all William's children had fitting titles.
Name guessing game starts: Alice and Arthur joint favourites
Alice or Mary? Victoria or Elizabeth? Albert or Philip? - the Duke and Duchess of Cambridge are likely to seek regal inspiration for their imminent arrival.
After opting for the traditional names George and Charlotte for their first two children, William and Kate are expected to keep it classic once again for baby number three.
According to bookmakers, Mary has been the front runner for a girl for some time, closely followed by Alice and then Victoria and Alexandra.
But an hour after the Duchess's labour was announced, Alice pulled away as the favourite. The female name is now joint favourite with Arthur for a boy at 5/1 - odds cut cut from 7/1 this morning. For a boy, the other favourites are Albert, Frederick, James and Philip.
Click here for more on the Royal baby name runners, riders and rank outsiders.
How soon will we know the baby's name?
The names given to royal babies are not usually revealed straight away, and the public is often left guessing for several days.
William and Kate took two days to announce both George and Charlotte's names, informing the Queen of their choice beforehand.
Mike and Zara Tindall used Twitter to unveil their daughter's name six days after she was born in 2014, with proud dad Mike tweeting: "For everyone who has asked what our daughter's name is, it's Mia Grace Tindall."
When Princess Beatrice was born in 1988, it was two weeks before her name was known.
In 1982, the Prince and Princess of Wales waited seven days before deciding upon and announcing Prince William's name.
The Prince of Wales's name, however, remained a mystery for an entire month and was only declared ahead of his christening in the Music Room of Buckingham Palace in December 1948.
Royal fans camped outside hospital for 15 days
Excitement is building outside St Mary's Hospital, where some fans have been camped out for 15 days hoping for a glimpse of the Royal baby.
The timing of the announcement, falling on St George's Day, added to the occasion for waiting royalists outside.
John Loughrey, 63, who is part of a group who have been camped outside the hospital, said: "We are so pleased. We have been here for 15 days.
"I'm so pleased it's St George's Day. St George himself would be very pleased if the baby's born today."
Mr Loughrey, from Streatham, south London, said he plans to celebrate the birth with English flags and a portion of fish and chips.
"It doesn't matter if it's a boy or a girl as long as it's a healthy baby and a healthy mother," he said.
"It's very good for our country and of course Her Majesty the Queen."
Another member of his group, 82-year-old Terry Hutt, also welcomed the news.
"It's fantastic to have another newborn baby," said Mr Hutt, who turns 83 at the end of the month and was hoping to share his birthday with the new royal. "If they were born on my birthday, I would have got a birthday cake."
Maria Scott, 46, from Newcastle, added: "I think it's going to be a boy and I think it's going to be quick."
The group were talking in front of their make-shift camp, including royal memorabilia and a Union Flag tent.
When will we see the Royal baby?
After the birth of Prince George, the Duchess left hospital the next day, while she left the hospital to go home on the same day after giving birth to Princess Charlotte.
But the length of the Duchess's hospital stay this time around will be entirely down to how she is feeling, so there is no guarantee we will see the baby within 24 hours of its birth.
The Duke and Duchess are expected to leave the Lindo Wing by the front door to give the waiting media the chance to take the photographs that will no doubt adorn the front pages of newspapers the next day.
After the birth of Princess Charlotte, the Duke and Duchess spent the first nights of her life at Kensington Palace before driving north to their country home, Anmer Hall, on the Queen's Sandringham estate, where they were likely joined there by the Duchess's parents, Michael and Carole Middleton, who often stayed over to help look after Prince George.
However, the family permanently relocated to Kensington Palace last year, after deciding Prince George should be schooled in London, so it's unlikely that they'll head back to Norfolk for a while.
Duchess admitted to hospital before 6am
It is understood the Duchess was taken to the private maternity unit of St Mary's hospital before 6am.
When the Duchess was pregnant with Princess Charlotte, her labour began in similar circumstances, with Kate being admitted around the same time and her daughter born just two hours and 34 minutes later.
Age-old custom behind announcing a Royal baby
After the Queen, other members of the Royal family and the Middleton family have been told that the Duchess has given birth, the Royal communications team will email media organisations with the sex, weight and timing of the birth.
Moments later, the news will be announced via Royal Twitter and Instagram accounts before a traditional paper announcement is placed on an easel outside Buckingham Palace.
Her Royal Highness The Duchess of Cambridge was safely delivered of a daughter at 8.34am.— Kensington Palace (@KensingtonRoyal) May 2, 2015
The age-old custom of placing a paper proclamation for the public to see at the Queen's London residence took place when Prince George and Princess Charlotte were born.
A brief formal announcement - on foolscap-sized paper set in a dark wooden frame - will be placed on an ornate golden easel on the forecourt of the Palace.
It will confirm the sex of the baby and the time of birth, but will give little else away, other than usually revealing that the baby has been "safely delivered" and mother and child are "doing well".
It used to be hand-written, but is now typed. It will also be signed at the hospital by the doctors who tended to the duchess, and then ferried back to the Palace by car.
All eyes on Lindo Wing as 'Great Kate Wait' gets under way
Royal fans have begun gathering outside the Lindo Wing as the "Great Kate Wait" begins. Supporters decked out tents in Union Jacks and put up flags around the area outside the private unit.
Royal baby looks set to arrive on St George's Day
If the Duchess of Cambridge gives birth by the end of the day as expected, the Royal baby will be born on St George's Day.
The patron saint of England, St George is heralded for his honour, bravery and gallantry. Surrounded by myth, one legend tells of St George's defeat of a dragon.
The Royal baby would also share their birthday with Lady Gabriella Windsor - the daughter of Prince and Princess Michael of Kent, who was born at the Lindo Wing, where Kate is in labour, on April 23 in 1981.
Famous names celebrating their birthdays on Monday include the model Gigi Hadid and actor John Hannah.
The baby has just missed arriving on the Queen's 92nd birthday which was on Saturday.
William and Kate are set to celebrate their seventh wedding anniversary on April 29, while Princess Charlotte turns three on May 2.
Who will deliver the Royal baby?
The medical team in charge of safely delivering Princess Charlotte was led by Guy Thorpe-Beeston, Surgeon Gynaecologist to the Royal Household.
Mr Thorpe-Beeston, an obstetrician who specialises in high-risk pregnancies, has a private Harley Street practice and is a consultant at the Portland private hospital and at the Chelsea and Westminster Hospital in the NHS.
A Cambridge graduate, he worked at King's College Hospital in London before becoming a consultant in foetal medicine at Chelsea and Westminster in 1996.
He was assisted by Alan Farthing, Surgeon Gynaecologist to the Queen, who was the fiance of the television presenter Jill Dando at the time of her murder in 1999, and has been part of the Queen's medical household since 2008.
In 2014 Sir Marcus Setchell, the recently retired surgeon gynaecologist to the Queen who delivered Prince George, told BBC Radio 4’s Woman’s Hour: “What happened in labour is an entirely private matter, but I do think there are certain situations when someone is giving birth that it’s important…to have a specialist…in the same room to deal with anything that’s immediately going to be wrong.”
Will the Duchess of Cambridge have a natural birth?
Both Prince George and Princess Charlotte are believed to have been born by a natural delivery, meaning the Duchess of Cambridge will presumably be planning to have a natural birth this time as well.
In 2015, Pat O'Brien, a consultant obstetrician at University College Hospital, said that because of the speed with which the Princess Charlotte was delivered after the Duchess was admitted to hospital, it is likely that she went into labour naturally.
He said: "The fact that she went into hospital at around 6am and had the baby by 8.34am would not imply that she was induced at all.
"Second time labours tend to be quicker than first time labours. Everything tends to go faster. The dilation stage is quicker, the pushing stage is usually quicker and easier as well, and the baby comes out more quickly. You would expect it to be an easier labour anyway."
Inside the £5,900-a-stay Lindo Wing
The Lindo Wing at St Mary's Hospital, where the Duchess of Cambridge is due to give birth, is a private facility offering "world-class maternity care".
Kate's first two children, Prince George and Princess Charlotte, were born in the exclusive unit in Paddington, central London, as were their father, the Duke of Cambridge, and uncle, Prince Harry.
William made his public debut with the Prince and Princess of Wales outside the hospital, wrapped in a white blanket and carried in Diana's arms, with Charles by her side.
Only a handful of midwives and medical staff, led by consultant obstetrician Guy Thorpe-Beeston, were in the delivery room to supervise Charlotte's birth but waiting in the wings were more than a dozen experts in case of emergencies.
Theatre staff were on stand-by along with a lab technician, replacement anaesthetists and paediatricians - 23 in total - from Imperial College Healthcare NHS Trust, which runs St Mary's Hospital.
In the Lindo Wing, Kate will again be given a bespoke experience akin to a five-star hotel with en suite rooms available "providing a modern, homely environment in which to start your new or expanded family life", the unit's website states.
Deluxe rooms and suites are also available. The latest price list, from July last year to March, states that a standard room package, including a one-night stay, costs from £5,900, while a deluxe package is £6,275 - with an extra night priced at more than £1,000 for both options.
The price of a suite of two rooms, with one used as a living room, is available on application but five years ago it cost £6,265 for a one-night stay.
With standard and deluxe care packages rising by around £1,000 since the birth of their first child, William and Kate could spend close to £7,500 for a suite.
Each room has a satellite TV with major international channels, radio, bedside phone, fridge, free wi-fi and a choice of daily newspapers.
All meals are freshly prepared in a dedicated kitchen and there is even an afternoon tea service, for parents to celebrate their new arrival, the website suggests.
The Lindo Wing's internationally renowned obstetric unit caters for complex pregnancies and deliveries as well as multiple births and it has the benefit of being based in an NHS hospital if further complications arise, including its facilities for premature babies in the Winnicott Baby Unit.
In 2006, William visited the refurbished NHS neonatal unit at St Mary's, cradling two tiny premature babies - one weighing just 5lb.
At the forefront of specialist care for premature babies, the Winnicott looks after some of the most critically ill newborns in the UK.
It treats around 350 sick and premature babies from across the country each year, caring for up to 18 infants at a time.
Diana returned to St Mary's in April 1997 - four months before her death in a Paris car crash - when she toured the paediatric intensive care unit, meeting poorly youngsters.
Royal watchers expecting swift delivery of Duchess's third child
With the baby on its way, press pens are now open outside the hospital as journalists, photographers and camera crews wait for confirmation of the baby's arrival.
Royal watchers will be expecting a swift delivery. With George, the duchess gave birth 10-and-a-half hours after being admitted to hospital, but Charlotte was born just two hours and 34 minutes after Kate arrived at the Lindo Wing.
Although it varies from woman to woman, some mothers report a speedier delivery third time around. For first-time mothers, active labour may take around eight hours and in a second labour around five hours, according to Babycentre.co.uk.
Clare Livingstone, professional policy adviser at the Royal College of Midwives, said: "It will vary from one woman to another. Some women report a quicker labour with their third baby but not everyone.
"It seems to be though that they do go more quickly. It's a very individual thing."
It is not known how long the Duchess was in labour with George and Charlotte before she was admitted. Kate had a straightforward, natural birth with George and Charlotte with no complications.
Duchess arrived at hospital by car and is in 'early stages of labour'
Kensington Palace said in a statement at 8.22am: "Her Royal Highness The Duchess of Cambridge was admitted to St. Mary's Hospital, Paddington, London earlier this morning in the early stages of labour.
"The Duchess travelled by car from Kensington Palace to the Lindo Wing at St. Mary's Hospital with The Duke of Cambridge."