Three-month-old baby does not poop, may be physiological factors, may be constipation, intestinal diseases, etc., according to the etiology of differentiation, in the treatment of the main medication, at the same time need to pay attention to daily care, specific analysis is as follows: 1. Physiological factors: commonly known as the belly, more than three months of the baby is most likely to save the belly of the situation, this time the cycle of stool will be prolonged, and some even appear half a month or so will not poop, but the baby’s state of mind as well as appetite will not have any impact, parents need to pay attention to distinguish. 2. constipation: if the baby is due to the usual intake of water is not enough, or the surrounding climate is dry, resulting in constipation will also have the above symptoms, this time mainly to medication, such as taking probiotics, etc., if necessary, can be combined with the Keseru for treatment. 3. Intestinal diseases: If the baby in the appearance of a long time not poop, and with crying, abdominal, distension, irritability, milk refusal, etc., may be intestinal diseases, such as congenital megacolon colonic obstruction, at this time you need to go to the hospital for surgical treatment. All of the above medications should be taken under the guidance of a doctor and should not be used on your own.