(Sera has started asking questions about where babies come from and the mechanics of being a girl)
Mom: "Well, mommies bleed once a month so that they can have babies."
Sera: "Where do the babies come out of?"
Mom: "They come out of mommies' vaginas."
Sera: "But they'd get stuck 'cause it's too small."
Mom: "Well, when you're having a baby it gets bigger."