Just read this post...wanted to mention that Ann and Merry, formerly potty trained, then regressed over Christmas (I mean, who wouldn't want to stay in diapers? ;) are now climbing up on the toilet, squatting, and ker-plop. I hope they don't fall in the toilet! And I think that they find it more efficient and easy than sitting on the pot, so to speak.
I remember that in some older/unremodeled restaurants in France you would still find the old "Turkish" toilets with places for your feet but not your butt...squatting toilets, so to speak. Makes sense to me now!