wording

I'm not sure why, but most of the time this works:

Me: Anja, do you have poop in your diaper?
Anja: No
Me: Is there any poop in your diaper?
Anja: No
Me: Did you poop in your diaper Anja?
Anja: No
Me: (pause)
Who has poop in their diaper? Does anybody here have poop in their diaper?
Anja: Yeah