Level 1: Causes of baby’s red buttocks The main cause of baby’s red buttocks is diaper rash. Diaper rash is skin inflammation caused by factors such as non-breathable diapers, excessive humidity, friction and other factors. In addition, the baby\’s skin is relatively delicate and easily susceptible to external stimulation, which can also cause red buttocks. Level 2: How to prevent baby\’s red buttocks 1. Change diapers frequently: Clean diapers need to be changed frequently to keep the baby\’s skin dry. 2. Pay attention to cleanliness: every time you change a diaper, use warm water and no fragrance or irritation.