Stool is an important indicator for assessing the state of an infant’s digestive tract. It is usually considered abnormal for a 100-day-old baby not to have a bowel movement for 10 days, which can be seen in functional constipation, congenital megacolon, etc. The immaturity of an infant’s digestive tract is easily affected by various factors. Infants’ digestive tract is immature, easily affected by various factors, usually through the number of bowel movements and the shape of the stool to determine the baby’s physiological status, etc., for 100-day-old babies, usually considered daily defecation, or every other day defecation, for the normal state, for the ten days of no bowel movement, usually abnormal. 1. Functional constipation: for the above situation of the baby appeared defecation interval obviously prolonged, such as the past defecation normal, there may be functional constipation, some of the baby can also appear abdominal, abdominal distension and other discomforts. 2. Congenital megacolon: can also be seen in congenital megacolon, such babies may have persistent constipation in daily life, and in severe cases, malnutrition, intestinal obstruction and other manifestations, abdominal radiography can assist in the diagnosis, and the need for active consultation and intervention. It is recommended to consult a specialist for evaluation and intervention.