Rocking the baby does work, say scientists studying crying youngsters' heart rates

Crying babies really do calm down when they are picked up and cradled according to a study that has discovered a deeper scientific basis to a phenomenon that every new mother soon realises to be true.
Scientists in Japan have found that the heart rate of crying babies slows down when they are in put in the arms of their mothers and carried about – but not if the mother remains still, the study found.
The Independent