...while trying to explain the soon-to-be-here sibling.
Mommy: "Avery, mommy has a baby in her belly"
Avery: (Blank stare)
Mommy: (Kneeling down so he can touch belly) "See?...Baby. Mommy has a baby."
Avery: (Lifts shirt and points) "Button."
(...walks off to play with toys)
I think that went well for now.