Newborns do not poop for a few days can be seen in the normal physiological phenomena, usually does not cause abnormal performance of newborns, can also be seen in abnormal pathological conditions (such as functional constipation), whether normal need to be specific medical judgment. 1. Physiological phenomenon: newborns defecation habits and their feeding methods and other factors related to individual differences, for a few days without defecation, but with the same defecation habits, and there is no obvious other abnormalities (such as abdominal distension, etc.), usually can be considered as a normal physiological phenomenon. 2. Pathological conditions (1) Functional constipation: if the newborn baby has prolonged time between bowel movements, or the dryness of the stool can affect the bowel movement, which can make the baby cry easily, and so on, which is not normal. (2) congenital megacolon: these newborns usually have a history of delayed discharge of fetal stool, usually can appear the above performance, constipation is often more stubborn, the use of open colostrum can be solved a small amount of stool, some babies can be accompanied by vomiting and other symptoms, is an abnormal situation. In addition, conditions such as congenital anisocoria can also cause the child not to poop. It is recommended that newborns who do not pass stools for a long time, or who experience other discomforts, should be seen as soon as possible and evaluated by a specialist for appropriate treatment.