Children with constipation can drink milk. The main components of milk are water, protein, fat and other nutrients, and the main reason of constipation is that children's food lacks enough dietary fiber, which can not stimulate intestinal peristalsis and produce enough liquid secretion, thus leading to dry stool. So drinking milk will not aggravate the symptoms of constipation. The treatment of constipation requires diet conditioning and drug treatment. Eat more cellulose-containing foods such as vegetables and fruits, such as spinach, cabbage, pitaya and avocado. At the same time, it supplements probiotics, regulates intestinal flora, and promotes digestion and absorption and intestinal peristalsis. Severe constipation can be achieved by oral lactulose softening stool and promoting intestinal peristalsis.