Small babies have weak gastrointestinal digestive function and often suffer from dietary discomfort, cold or viral or bacterial infections that cause bar diarrhea. In addition to the necessary medication, diet is also very important during diarrhea. The old belief is that babies should fast when they have diarrhea, so as to reduce the burden on the stomach and intestines, thus slowing down gastrointestinal motility and reducing the number of diarrhea. However, the opposite is true: the hunger caused by fasting can lead to an exponential increase in the number of gastrointestinal motions, and the number of diarrheas will increase. The new philosophy of diarrhea diet is to advocate continued feeding without fasting to avoid significant weight loss in the short term, especially for breastfed babies who should continue breastfeeding. Unless the child vomits violently or has significant bloating and diarrhea after eating, fasting may be given temporarily for 4-6 hours. babies under 6 months of age continue to breastfeed. Babies aged 6 months or older should continue to eat the daily food to which they have become accustomed, with light and easily digestible food, and reduce meal size appropriately… Viral enteritis often secondary to biosaccharidase, can drink lactose-free formula for 1-2 weeks, and can switch to the original feeding after the diarrhea improves. For milk protein allergic diarrhea, special formula amino acid milk powder or deeply hydrolyzed milk powder can be given. Babies who add complementary foods are advised to avoid foods with known allergies such as milk, peanuts, fish and shrimp. Diarrhea is a common symptom in infancy and early childhood, and scientific feeding during diarrhea is beneficial for recovery from diarrhea.