Diaper rash is a red and inflamed rash on the skin covered by a diaper. Diaper rash is a common skin problem in babies and young children, usually between the ages of 9 and 12 months, but it can occur in any age group of babies who wear diapers.

Diaper dermatitis, also known as diaper rash, is a common pediatric problem that can be stressful for both the child and the parents because the problem persists despite diligent diaper changes. Diaper dermatitis can occur in any child who wears a diaper but is most common in children between 9 and 12 months of age.