Not really. Generally speaking, chlorinated water is safe for babies and young children, though some do claim it can cause diaper rash (while others claim it helps). However, a rash after the pool may be due to moisture against the skin. When we interviewed Dr. Garbi, the Chief Pediatrician of Blueberry Pediatrics, for our guide to cloth diapers and diaper rash, she explained that moisture against the skin is the number one cause of diaper rash. With that said, if your child has highly sensitive skin or a severe diaper rash already, you may want to avoid chlorinated water.