Its a topical treatment contain ingredients that provide a barrier between the baby's skin and irritants, such as zinc oxide, which is known for its protective and soothing properties. Other ingredients may include petrolatum, lanolin, or calendula, which help moisturize, heal, and calm the skin. Designed to protect and soothe babies' skin, specifically to prevent and treat nappy or diaper rash. Diaper rash is a common condition caused by prolonged exposure to moisture, friction, and irritation from diapers.