When the baby has diarrhea, it is recommended to stop adding supplemental food, according to the pre-diarrhea supplemental food feeding, and then continue to add new supplemental food in small amounts gradually after the diarrhea improves. There are many causes of diarrhea, according to the cause is divided into infectious factors and non-infectious factors, it is recommended to find the cause of medical examination and treatment. If the diarrhea is caused by infection, it should be treated before adding new complementary foods. However, if the diarrhea is caused by improper feeding or allergic diarrhea, nutritional treatment should be provided depending on the specific situation. For example, lactose-free formula can be used for diarrhea of sugar origin (most commonly lactose intolerance). Allergic diarrhea should avoid allergic foods and go to the hospital for allergen testing. When the baby diarrhea eating and absorption is reduced, while the nutritional needs increase, so it is emphasized to continue the diet, according to the special pathophysiological conditions of the disease, the individual digestive and absorption function of reasonable adjustment. It is recommended to seek medical advice to find the cause of the disease and treat the cause, and then continue to add new complementary foods as prescribed by the doctor after improvement.