Most babies experience diaper rash in their lifetime. Whether it is caused by a new food, wet diaper or side effect from medicine, the red, chapped skin is painful to baby and worrisome for Mom and Dad. The best treatment? A dry bottom. Make sure your child is completely dry after a diaper change, even if it means going naked for a few extra minutes. Change diapers more frequently, and use one of the many over-the-counter products to soothe and calm the skin.