Each child has different bowel habits. Not every child moves his or her vowels every 24 hours. If, however, your child has pain during bowel movements, the stools are abnormally hard, or there is mucus or blood (bright red or dark tarry), call the office. Some common causes of constipation are too much milk or other dairy products, or not enough wheat products, vegetables and fruit in your child’s diet. Typically, a change in diet alone improves the situation.