Children's diarrhea can be classified into infectious and non-infectious types. Generally, if it is infectious diarrhea, the diet should be light and easy to digest, avoiding greasy, spicy foods. Most cases of infectious diarrhea can be controlled within about a week with anti-infection and symptomatic fluid replenishment treatments. However, for non-infectious diarrhea, such as allergic diarrhea, milk allergy, or egg allergy, it is necessary to avoid allergenic foods and also focus on a diet that is light and easy to digest, avoiding spicy and greasy foods. If lactose intolerance causes the diarrhea, then intake of lactose-containing foods, especially lactose-containing milk, should be avoided; lactose-free formula should be used instead, and treatments like lactase may be added.