Newborns do not defecate for two or three days, it may be normal, or it may be caused by insufficient feeding, functional constipation or organic constipation. 1. Normal phenomenon: the number of daily bowel movements of newborns is not fixed, may be several times a day, there may be occasional phenomenon of two or three days without defecation, but as long as the newborn’s spirit is normal, the amount of milk is normal, do not need special treatment. 2. Insufficient feeding: mostly seen in breastfed newborns, mainly because of insufficient breastfeeding, resulting in the newborn’s intake of breastmilk is small, can not generate enough stools, which leads to the above symptoms. Parents can feed their newborns at regular intervals to relieve the symptoms. 3. Functional constipation: If too much breastfeeding, or the digestive system is relatively weak, resulting in food can not be digested and absorbed in a timely manner, thus the accumulation of feces will cause functional constipation. If you don’t have a bowel movement for two or three days, you can take oral probiotics such as bifidobacteria to regulate the situation, and you can also take laxatives such as lactulose orally, and if necessary, you can use corkscrew to help with the bowel movement. 4. Organic constipation: Organic constipation in newborns is mostly seen in congenital megacolon, due to fecal matter in the intestinal tract blockage caused by the lack of defecation. Surgery is usually required. Newborns do not defecate for two or three days, if accompanied by other uncomfortable symptoms and symptoms continue to be unrelieved, you need to consult a doctor in time to cooperate with the treatment. The above medications should be used in accordance with medical advice.