Constipation in newborns may be caused by digestive tract malformations, inherited metabolic diseases, improper feeding, and abnormal intestinal function. 1. Gastrointestinal malformations: such as congenital megacolon, congenital anus, anal stenosis, etc. may lead to organic constipation in newborns. 2. Inherited metabolic diseases: such as hypothyroidism, congenital stupidity, etc., can lead to slow intestinal peristalsis in newborns, causing co-functional constipation. 3. Improper feeding: If the long-term diet is insufficient, the amount of food is too small, the intestinal residue is too small, not enough to stimulate gastrointestinal peristalsis, may also lead to functional constipation. And if there is too much protein content in the food and not enough carbohydrates, and too much calcium soap in the feces that cannot be dissolved, it may also cause functional constipation. 4. Abnormal intestinal function: Due to the newborn’s irregular diet and bowel habits, the bowel reflex is not formed or weakened, which may also lead to functional constipation. When the newborn is constipated, it is necessary to consult a doctor in time to clarify the cause and reasonable treatment.