Diarrhea from breastfeeding is caused by indigestion, food allergies, lactose intolerance and other factors. In infancy, the gastrointestinal system is not particularly perfect, eating too much breast milk intestinal system due to the inability to digest the food therein, so the symptoms of diarrhea will occur, parents should reduce the intake of breast milk to help improve. Some women do not pay attention to the light diet during breastfeeding, often eat seafood or spicy, stimulating food. These foods will be metabolized into the breast milk, and when infants and young children consume this breast milk, they will also experience diarrhea symptoms because their intestinal system will have an allergic reaction. Diarrhea in some infants and young children eating breastmilk is directly related to lactose intolerance, which is a symptom caused by the lack of lactase in the intestinal system, which cannot break down the lactose in breastmilk, so breastfeeding should be discontinued, and lactose-free formulas should be used for feeding.