In a recent study, researchers have explored and analysed the relation between mood and memory developments in infants. The fact that babies have learned when feeling calm is inaccessible when they're active and vice versa has been shown in a study conducted by developmental psychologists at Ruhr-Universitat Bochum (RUB) with 96 children aged nine months. The results of the study were published in the journal Child Development. The mood of infants is unpredictable: they may be playing happily one moment and be completely inconsolable the next. We remember experiences that we had in a certain mood, especially when we are in the same mood again.