Diaper rash is a common condition in infants caused by prolonged exposure to moisture, friction, or irritants in diapers. Treatments typically include keeping the area clean and dry, changing diapers frequently, and using barrier creams containing ingredients like zinc oxide or petrolatum to protect the skin. In more severe cases, a pediatrician may recommend medicated creams or ointments. It's also important to allow the baby's skin to air out by letting them go without a diaper for short periods. If the rash persists or worsens, consulting a healthcare professional is advised for further evaluation and treatment options.