Most cases of diarrhea (runny or watery bowel movements) are caused by gastrointestinal (GI) infections. Diarrhea usually is not a sign of a serious illness, but it can cause kids to lose fluids, salts, and minerals. If your child has diarrhea, it's important to make sure fluids and nutrients are replaced.
Depending on the amount of fluid loss and the severity of diarrhea, your doctor will probably instruct you to:
Do not offer plain water to infants — it doesn't contain enough sodium and other minerals. Avoid apple juice and other sweet drinks because they may make diarrhea worse.
Make sure kids wash their hands well and often to avoid getting infected with germs that can cause diarrhea. Wash fruits and vegetables thoroughly before eating, and refrigerate meats as soon as possible after buying them and cook them until they're no longer pink.