Two-month-old babies have no bowel movement for three days, considering physiological factors or pathological factors, physiological factors mainly refers to the phenomenon of physiological accumulation of belly; pathological factors are mainly considered to be the existence of constipation. 1. Physiological factors: 2-month-old babies are prone to rational belly saving phenomenon, which may be due to the rapid development of the infant’s digestive system, so that the amount of food it holds increased, so the situation of delayed defecation. 2. Pathological factors: when the infant has too little water, intestinal peristalsis is weak and other factors, it is easy to constipation, the symptoms of delayed defecation. When infants are constipated, in addition to delayed defecation, they may also have symptoms such as dry stools and difficulty in defecation. The two-month-old baby did not have stool for three days, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.