A small baby not pooping for a few days may be caused by dietary factors, congenital megacolon, and other reasons. It can be treated by medication, surgery, and other means under the guidance of a doctor. 1. Dietary factors: too little water during diet, too dry food, adding supplemental food, etc., may lead to dry stools and lumps, and the situation that the baby has not pooped for a few days. It can be regulated through a balanced diet, adequate water intake, etc. If necessary, probiotics can be taken to regulate the intestinal flora and promote defecation. 2. Congenital megacolon: Congenital megacolon usually has stubborn constipation, abdominal distension and other symptoms, which may lead to the situation that the baby did not poop for a few days. It can be treated with laxatives such as lactulose and glycerin suppositories, lubricants and other types of medication, and if necessary, with surgery such as laparoscopy and other treatments such as colonic irrigation. The baby did not poop for a few days there may be other reasons, it is recommended to promptly under the guidance of the doctor to clarify the cause of treatment. Avoid self-medication, resulting in adverse consequences. If you need to use medication, please follow the doctor’s instructions.