Diaper rash causes a baby's skin to appear red and irritated; the affected area is typically limited to the area under the diaper, including the genital area and buttocks. Symptoms range from a small patch of red skin to large bumps and extensive areas of red skin.
Irritation from wetness or bowel movement is a common cause of diaper rash. Some babies have diaper infections after trying new foods. Other diaper rashes happen when a baby is on antibiotics. A bacterial or yeast infection in the diaper area can also cause the rash to appear. Being aware of these causes can help a parent identify a diaper rash early to start treatment before it becomes painful for the baby.