Three months baby does not stool only fart whether for save belly, according to the baby’s bowel movements to judge, some children do not defecate for three or four days and no painful performance, until the defecation is still yellow soft stool, no hard knots, the amount is not particularly much, this situation for save belly. Save belly is mainly due to the continuous improvement of the baby’s digestive system, when the baby before and after the full moon to two months of a period of time, the gastrointestinal tract of digestive enzymes increased, intestinal peristalsis increased and become regular, gastrointestinal absorption function than just born has improved greatly, can be fully digested and absorbed breast milk. The daily food residue is very little, not enough to stimulate the rectum to produce the bowel reflex, there is the phenomenon of saving belly. Although the child has a few days to defecate once, but the discharge of the stool is a normal yellow soft stool, which is the key to save belly and constipation difference. Although the development of each baby is different, but generally after two months will recover on their own, as long as the baby’s digestion is better, there is no need to overstress.