Vomiting and diarrhea caused by the stomach bug are common in children and typically resolve with at-home care. But how do you know when to manage it yourself and when to seek medical help? Pediatrician Cindy Gellner, MD, offers guidance on spotting signs of dehydration, understanding the virus's typical course, and knowing when symptoms suggest something more serious. Get advice on safe hydration, what to feed—and avoid—during recovery, and when your pediatrician or the ER should be involved.