The causes of constipation in babies are classified as physiological constipation and pathological constipation. 1, physiological constipation: food intolerance, poor dietary habits and drinking less water are causes of constipation, this problem, you need to improve the bad dietary habits to relieve constipation; (1) eat more food containing dietary fiber, such as sweet potatoes, bananas, celery and the like is conducive to laxative; (2) daily clockwise to the baby’s stomach massage, can promote intestinal peristalsis, improve constipation; (3) let (3) let the baby drink more water, can have the effect of softening stool; (4) establish defecation habits, can urge the baby to defecate regularly every day, to avoid dry stool baby from psychological refusal to defecate; (5) medication can be with bacillus subtilis or bifidobacteria to relieve the baby’s constipation symptoms, can also try some digestive Chinese medicine preparations to help defecation, can also use lactulose to deal with. Physiological constipation is often able to ease after improving habits and food regimen. 2, pathological constipation: because of megacolon and colonic redundancy, dry stool, defecation difficulties, vomiting, abdominal distension and other symptoms. (1) megacolon: also known as congenital anaplastic ganglion cell disease, is a common congenital intestinal malformation, with delayed fetal bowel discharge, persistent constipation and abdominal distension, vomiting, malnutrition and developmental delay as the main clinical manifestations. (2) Colonic redundancy: children often present with progressive aggravation of constipation symptoms, may be accompanied by abdominal pain, nausea, vomiting, etc., probiotics, diet improvement did not relieve, can be clarified by imaging. Therefore, the cause of constipation in children must be identified and treated symptomatically in order to get twice the result with half the effort.