I have a son who, for years now, has always plugged the toilet. Does not matter if he has a big poop or a little poop. My husband says it's made of cement.

We have tried to give him more fiber. He does it no matter which toilet he uses -- ours or Grandma's. It's kind of irritating when we don't know he's done it before he's gone to bed, because then if we use the toilet during the night, it will overflow! Not fun to plunge a toilet in your PJs!

Any ideas??