Infants and young children a week without bowel movement is considered to be caused by physiological factors, but may also be the emergence of disease conditions, such as functional constipation. 1. physiological factors, infants and young children a week without bowel movement may be the phenomenon of saving the belly, due to the gradual development of the digestive function of infants and young children, this symptom may occur, as long as the infants and young children do not have abdominal pain, abdominal distension, mental instability and other symptoms, generally do not have to worry too much. 2. Pathological factors, some infants a week without bowel movement may be related to disease, such as functional constipation may lead to not bowel movement. Usually need to pay attention to the infant’s diet, it is best not to eat too much at once, if it is formula feeding, it is best to drink more water between meals, to avoid constipation symptoms.