Half-month-old babies without stool for two days may be a normal physiological phenomenon, but it may also be related to indigestion, congenital megacolon disease, intestinal obstruction and other diseases, which is not normal and requires prompt medical attention. Generally speaking, half-month-old infants are mostly breastfed, the number of stools a day should be about 2 to 3 times, if the breast milk is insufficient, formula feeding, the number of stools in 1 to 2 days once or so. However, as the gastrointestinal function of infants is not fully developed at this time, the bowel movement has not formed a fixed pattern, and individual differences are large. Therefore, it may be normal for infants not to have a bowel movement for two days. If an infant has no bowel movement for two days, accompanied by vomiting, abdominal distension, irritability and other abnormal manifestations, it is usually abnormal, and may appear dyspepsia, or congenital megacolon or intestinal obstruction, etc., and need to consult a doctor in a timely manner, to exclude pathological factors. If necessary, actively cooperate with the doctor’s treatment, so as not to delay the condition, etc..