Your preschooler suddenly needs the bathroom every few minutes—but seems otherwise fine. While alarming for parents, this common phase is often harmless and linked to stress, routine changes, or bladder habits rather than disease. Pediatrician Cindy Gellner, MD, explains why frequent urination happens in young children, how long it usually lasts, and what parents can do to help. Learn the warning signs that deserve medical attention and how reassurance often becomes the best treatment.