When a child experiences diarrhea, it indicates an increase in the frequency of bowel movements and a change in the nature of the stools. The first principle of treating diarrhea is to continue feeding the child, so it is acceptable for children who drink cow's milk to continue doing so. However, if the diarrhea persists for a long time and the child develops lactose intolerance, it may be considered to switch to a diarrhea-specific formula, which is lactose-free, as this will be more beneficial for the child's recovery from diarrhea. Normally, it is possible to continue giving cow's milk, as the feeding must continue to ensure the child's adequate nutritional needs. Otherwise, fasting the child and providing nothing to eat, coupled with diarrhea, can quickly lead to dehydration, acidosis, and electrolyte imbalances.