Seven-month baby diarrhea with foam, related to indigestion, lactose intolerance, some people when breastfeeding, will prefer to eat food with high carbohydrate content, these food components will be absorbed by infants through milk secretion. As the digestive system of infants is not particularly perfect, can not digest these ingredients, so there will be indigestion symptoms, which will be accompanied by diarrhea, and more foam in the feces, this situation needs to be breastfeeding women, to reduce the potato, sweet potatoes, cookies and other food intake. Some babies are lactose intolerant. These babies are unable to break down the lactose in milk powder, which causes the lactose to remain in the intestinal system, irritating the intestinal system and causing diarrhea with foamy stools. Babies with lactose intolerance should be fed with a different lactose-free formula to improve their condition.