Yes, it is possible for a child to be constipated if they are not having regular bowel movements. It is important to ensure they have a balanced diet that includes plenty of fruits, vegetables, and whole grains to help prevent constipation. Using over-the-counter laxatives can also be helpful in treating constipation. Additionally, for diaper rash (erythema), it is important to keep the affected area clean, dry, and use barrier creams and antifungal creams as needed. It is also recommended to let the skin air out and clean it gently after each bowel movement.