There are many causes of diarrhea. The most benign causes are not treated. Conventional medicine in pediatrics just supports and observes the patient until the body heals. These are mostly the winter stomach flu, taking antibiotics or eating a bad batch of fried rice or food prepared by someone who did not wash their hands. Homeopathy is great and safe for this kind of short illness. I love arsenicum album. 3-5 pellets every 15 minutes for abdominal pain and diarrhea usually helps me.