New parents always receive "instructions" to ensure baby's safety. Among them, it is forbidden to make the little one sleep on the belly. The position lying on the back is strongly recommended, not to say mandatory. After nine months in the womb, it is quite possible that baby will not sleep comfortably lying on a firm mattress. In addition, many babies suffer from reflux or digestive problems. They fall asleep best on the belly. So, why not allow this position during naps or stimulation…