Vomiting and diarrhea are the banes of the pediatrician's existence. Perhaps due to the prevalence of stomach problems, there is a wealth of old wives' tales and remedies about vomiting and diarrhea. Surprisingly, most of the alleged age-old wisdom is not helpful in these situations, and it can even be harmful. Before you venture out and follow your great-aunt's advice for curing your child's diarrhea, make sure you have the facts straight.