If a baby’s bottom is red and cracked, it may be caused by diaper rash or dry stool. It is recommended to clean the baby’s bottom with water after each bowel movement, avoid using wet diapers, and switch to breathable cotton diapers. Additionally, the cracking of a baby’s bottom may also be due to dry stool. Specific reasons require a visit to a local hospital for examination to understand the situation. If the problem is severe, please seek medical attention promptly.