Those under 13 must have adult supervision. I never put my daughter in the kiddie pool until she was potty trained, and now she is 7 and still likes to get in the kiddie pool because she can stand up in the water whereas she can't in a regular pool. I prefer that children in diapers stay out of public pools, period. It is a HUGE health issue. Why would you want to subject others to the possibility of ecoli? It can be deadly in children.