acuation - Hirschprung disease<br />  o functional anatomic - anal-rectal positioning doesn't allow easy evacuation<br />  o mechanical - a tumor physically blocks stool passage<br /><br />Breast fed babies are essentially never truly constipated. This is because breast milk is such a low residue diet. Almost all of the milk is absorbed by the baby and used. The stools consist of a small amount of unabsorbed protein curds and a large amount of bowel secretions, chiefly mucus. And of course a lot