Foamy stools in 1 year old babies may be caused by indigestion, lactose intolerance and intestinal infections. 1. indigestion: due to the 1-year-old baby gastrointestinal function is relatively fragile, after eating too mixed, too cold food, resulting in food stagnation in the intestines and stomach, indigestion phenomenon caused by the baby’s stool with foam. 2. lactose intolerance: 1 year old baby stool foam may be caused by lactose intolerance, due to lactase secretion decrease, resulting in the intestinal tract can not fully digest, decomposition of breast milk or cow’s milk in lactose, thus causing non-infectious diarrhea, stools are foamy. 3. intestinal infection: 1 year old baby stool foam may be caused by intestinal infection, due to viral or bacterial infection, resulting in food in the intestinal tract fermentation and gas production, appearing in the baby in the stool bubbles or tofu sludge-like phenomenon. 1 year old baby stool foam, there may also be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.