Level 1: Why does the baby have a red butt? Red butt refers to an inflammatory reaction in the skin around the buttocks and anus of infants and young children, resulting in redness, itching, pain and other uncomfortable symptoms. The main reason is that the skin surface is damaged due to diaper friction, urine and feces irritation, thereby causing bacterial infection or fungal infection. Level 2: How to prevent red buttocks in babies? 1. Keep it dry: Every time you change a diaper, pay attention to cleaning your baby’s skin in time.