Q: Potty training advice needed: Our son just turned 3. He's great with peeing, except he still wears diapers for sleeping. We are struggling with pooping. He knows he's supposed to go in the potty.

The source of their distress? A small child who is trying to learn how to poop like a member of modern society. Ask any parent who has had to do multiple loads of particularly unpleasant laundry, or ...