Is it Big or Small

(Talking to Katelyn while she's on the toilet)

Daddy: So is it big or small?

Katelyn:

(not knowing the idiom, looks into the toilet she's sitting on and turns around and hand gestures a size)

It was about this big, but now it's 2 pieces of this big

Daddy: I didn't need to know that!

Daddy: (laughs with a big girlish grin)