Baby three days without poop may be a normal phenomenon, may also be abnormal dietary structure or congenital megacolon and other factors. If an infant or toddler has not had a bowel movement for three days, but there are no other abnormalities, it may be a normal phenomenon, also known as the belly, usually through massage and other methods to gradually return to normal, generally does not cause too much impact. The baby’s daily diet is irregular, drinking less water, and there are defecation difficulties, stools are dry and hard, may be constipation. At this time, diet should be adjusted to gradually relieve constipation. When the baby has congenital megacolon, the baby may not poop for three days, and may be accompanied by abdominal distension, difficulty in defecation, difficulty in feeding and other symptoms. Prompt medical attention is recommended, and if necessary, surgical treatment. Babies who have not pooped for three days and are accompanied by other abnormal manifestations may have disease factors and should seek medical examination and treatment.