Infants do not have stools for four days, summarized in the following reasons: a class of functional constipation, food composition is not appropriate, such as food with too much protein and not enough sugar, dry stools lead to constipation. Long-term dietary deficiencies, food digestion, less stool in the intestines; malnutrition makes the abdominal muscle, intestinal muscle thin, tension is weakened, peristaltic weakness, appearing stubborn constipation. Due to irregular life and defecation, the formation of defecation reflex is weakened or not formed; intestinal muscle relaxation and constipation. This type of constipation can be cured after conditioning. The other category is organic constipation, which is due to gastrointestinal diseases (anorectal malformation, surgery or trauma, etc.), neurogenic diseases (congenital megacolon, spinal cord lesion, cerebral palsy, etc.), endocrine metabolic diseases (hypothyroidism, renal tubular acidosis, diabetes, etc.), drugs, infections, poisoning and autoimmune diseases can also damage the gastrointestinal tract leading to constipation. For this type of constipation, the first step is to remove the cause, along with symptomatic treatment. The vast majority of babies with no stool for 4 days are functional. We adjust the following methods: 1, regular defecation: infants from 3 to 4 months can be trained to defecate regularly. Because the intestinal peristalsis accelerates after eating, often appear stool, so it is generally advisable to choose to let the child defecate after eating, to establish the conditioned reflex of stool, it can play a half-hearted effect. When defecating to focus on, it is best to 3-5 minutes to finish defecating, do not squatting pot for a long time or play while squatting pot. 2, adjust the baby’s diet: if the baby is breast-fed, due to insufficient breast milk constipation, for this constipation, as long as the amount of milk, constipation symptoms then relieved; if the baby is formula-fed more prone to constipation, which is most likely due to excessive casein content in milk, thus making the stool dry and hard. In this case, the amount of milk can be reduced and the amount of sugar increased. Children who can eat complementary foods, the diet pay attention to adding coarse grains and fiber-rich vegetables (such as celery, leeks, potatoes, carrots, etc.). 3, abdominal massage: massage with the palm of the hand in the direction of the colon, can be carried out before bedtime, once a day, 20-30 times each time, adhere to many days effective. 4.Medication: for fecal impaction, you can use open-cell laxative or saline bowel cleansing. Short-term stimulating laxatives can be used to lift the blockage. Laxatives include osmotic drugs (lactulose, sorbitol, polyethylene glycol), bulking agents (wheat bran, dietary fiber), intestinal dynamics (cisapride, erythromycin), lubricants (vegetable oil, liquid paraffin), stimulant drugs (senna, glycerin suppositories) five categories, the first three are preferred. 5, the application of probiotics: probiotics as a kind of beneficial flora from the external supplement, after entering the intestine, will promptly adjust the balance of the intestinal flora, so that there is diarrhea, constipation and other symptoms to get better, and to some extent will increase the self-regulation function of the intestine. In short, the goal of treatment is to remove the cause of the disease, restore the normal gastrointestinal transmission and discharge function by improving dietary habits, improve fecal symptoms, and develop normal bowel habits.