Button, button, who has a belly button?

Eden is fascinated with belly buttons. Every time I change her diaper she requests to see my "bu-bun" or sometimes she calls it "bum" (I know...trust me, I know). So I have to lift up my shirt and show her my "button" and then we have to find her "button". I've compared notes with Daniel and he says he has to fulfill the "button" request as well. She even points out belly buttons on characters in books. I'm sure someday she will try to find a belly button on one of the cats. I'm just hoping that she doesn't request "buttons" in public. That would be fun.