Newborns do not poop for two days is mostly normal, a few may be gastrointestinal dysfunction, inadequate feeding and other abnormalities. Newborns gastrointestinal function is not yet well developed, the diet is all dairy products, there will be irregular bowel movements, 2 to 4 times a day stool or 2 to 3 days a stool, stool properties normal, the baby to eat milk and sleep well, no other discomfort, usually belong to the normal. Some newborns usually have a bowel movement more than once a day, suddenly appeared two days without defecation, can be temporarily observed and followed up, such as the baby appeared blood stool, abdominal distension, poor mental response and other manifestations of neonatal necrotizing small bowel colitis need to be alert to neonatal necrotizing small bowel colitis and other diseases may be, it is recommended to seek medical attention in a timely manner. Some newborns do not pass stools for two days and urine output decreases, considering the possibility of insufficient feeding, it is recommended to feed according to demand, and supplement the insufficient part of breast milk with formula milk to ensure sufficient milk supply. Some newborns who have not had a bowel movement since birth should also be alerted to the possibility of congenital dysplasia, such as anal atresia or congenital megacolon. Newborns who do not have a bowel movement for two days with other discomforts are advised to see a specialist to clarify the cause of the problem, to avoid delaying the condition and affecting the baby’s healthy growth.