Megacolon mainly occurs in infants. Mild megacolon usually has symptoms such as constipation, abdominal distension, vomiting, and abnormal fetal bowel movements. 1. Constipation: It is mainly caused by the accumulation of feces in the colon, which can not be discharged for a long time, causing the symptom of constipation, and in serious cases, it is necessary to pass an enema in order to discharge the feces smoothly. 2. Abdominal distension: the child will have the symptom of abdominal distension, and when the abdomen is pressed, there will be pain and crying. 3. Vomiting: It is related to constipation and bloating. Constipation for a long time will cause vomiting, while bloating will cause vomiting if the baby eats. 4. Abnormal bowel movement: for example, no bowel movement or less bowel movement. It is recommended to give effective treatment to megacolon in time, because when megacolon develops seriously, due to the large amount of fecal matter accumulating in the intestines, it is easy to cause intestinal perforation and other complications.