3 months baby four or five days to pull once, whether normal can not be generalized, if the physiological factors lead to, it is normal; if constipation and other pathological factors lead to, is not normal. 1. physiological factors: 3 months of exclusive breastfeeding to the baby, if only the frequency of stool decline, but not accompanied by defecation difficulties, fart odor, hard stools and other symptoms of discomfort, to consider the baby to save the belly, this time you can observe, and massage the perianal area, to stimulate defecation. 2. constipation: 3 months baby four or five days to pull once, if the emergence of defecation difficulties, fart odor, bloating, crying and other symptoms, to consider the possibility of constipation. 3 months baby four or five days a pull, there may be indigestion and other conditions, it is recommended to exclude the normal physiological factors and timely medical care, to identify the cause, if necessary, with the doctor treatment.