When it comes to bathroom habits, what is normal for kids? According to Dr. Mark Corkins, chief of pediatric gastroenterology at Le Bonheur, normal has a broad range, and variations in stool (frequency, consistency, etc.) are common. In the second of a two-part series, Dr. Corkins weighs in on two common poop issues – diarrhea and constipation. Today, he tackles constipation.