The reasons why 1-month-old babies don’t poop include insufficient milk intake, imbalance of intestinal flora, and intestinal diseases, which can be improved by increasing the amount of breastfeeding, taking probiotics, and surgical treatments respectively. 1. Insufficient milk intake: When the milk intake is insufficient, most of the milk will be digested and absorbed, leading to a decrease in stools and thus no bowel movement for a few days. In this case, the amount of feeding can be increased appropriately. 2. Imbalance of intestinal flora: Dietary changes may cause changes in the intestinal environment or abuse of antibiotics, resulting in constipation due to imbalance of normal intestinal flora. Probiotics such as bifidobacteria can be used to regulate the condition as prescribed by the doctor. 3. Surgical intestinal diseases: if there is congenital megacolon, anal stenosis, etc. will also appear constipation symptoms, this time the need to take surgical correction of the means of treatment. If the baby constipation accompanied by serious crying, refusal to eat, etc., should be timely consultation, under the guidance of the doctor to clarify the cause of the disease, to take targeted treatment.