1. What is baby’s red buttocks? Baby red bottom, also known as diaper dermatitis, is a skin inflammation caused by babies wearing diapers for a long time, especially when the diapers are not changed in time or cleaned thoroughly. It usually presents with redness, pain, moistness, and sometimes blisters or ulcers. 2. What is the reason for baby’s red buttocks? 1. Diaper friction: especially when your baby rolls or crawls on the bed. 2. Humidity: When diapers remain wet for a long time, it increases the growth of bacteria and yeast. 3. Chemical substances: such as