Foamy stool in infants is considered to be triggered by various factors such as lactose intolerance, indigestion and acute gastroenteritis. 1. Lactose intolerance, some infants have foamy stools may be related to lactose intolerance, if eating too much lactose, lactose intolerance, not timely decomposition, this symptom may occur. 2. Indigestion, some infants eat too much at one time may lead to decreased digestion and absorption ability, indigestion, food is not completely broken down through the intestinal tract, so there may be symptoms of foamy stools. 3. Acute gastroenteritis, some infants with acute gastroenteritis, intestinal inflammatory secretions increase, may appear this symptom. Foamy stool in infants may also have other causes, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or therapy.