On Momversation: Where Do Babies Come From?

In this episode of Momversation, Heather Armstrong from dooce.com has a vexing problem: How do you tell your 4-year-old about how the baby you're carrying got there in the first place? I know what I'd say - I'm kind of nuts and bolts - but I'm curious to hear what other moms would say. In a pinch, Heather came up with a good cover story you can remember, as well.