Sometimes, when Kiddo is pushing Michael to the edge, he offers that he will give her a good spanking. We are not spankers, so this is largely a vent for him. He often follows up that comment with the reflection that she doesn't even know what a spanking is.
I now have proof.
After wiping her bottom today, her little bottom cheeks were just so visible, that I patted them firmly for a bit. After a moment she asked: Why are you clapping my bottom?
Later, after another visit to the bathroom, she wanted to clap her bottom again.