Sugar things up

Overheard just now:

Amy: "Daddy, I have decided to call Michael sugar."

Daddy: "That's great, why did you decide to call him that?"

Amy: "Because I like that name, but you now what I USED to call him?"

Daddy: "No."

Amy: "I USED to call him diaper (squeals of laughter) but now I call him sugar."

Daddy: absolutely speechless.