"Mommy, its time for us to have another baby, not a boy baby, but another baby"
"I would be the Mommy and Nate would be the Daddy"
me-"where would you get the baby?"
"from the Dr's office"
"Where do babies come from?"
"I be the Daddy"-Nate
me-"from Mommies and Daddies"-after a long pause, sensing at 4ish-she doesn't actually want to know the details, but not real sure how much information to give her. I think that was enough, because she went on with her conversation.