Babies on the Brain

Catchy title, right? Well, sorry to disappoint, but it's not me who has babies on the brain, it's Blake! This morning as I was taking him to Nancy's house and he was full of questions and I was not prepared at all. He said, "Mom, I think we need to put a baby in your belly."
Startled, I said, "Why do you say that Blake?"
He responded, "Collin has a new baby brother, Mason has a new baby brother, Ty has a baby sister, and Erica is having cousin, I want a new baby, too."
I thought I was off the hook when I said, "But, Blake, you already have a little brother, Bryce"
He said, "Yeah, but I want another one, and I want it to be a sister."
Then the dreaded question came . . . "If you have a baby in your belly, how does it get out? Does your belly break?"
I stalled long enough to come up with something about it being a miracle from God, only he wasn't satisfied. He asked again, "Yeah, but how does it really get out?"
I gave in to the pressure and told him that the baby comes out of my belly button!!!!
Was I right or wrong to tell him that, I don't know, but it was honestly all I could come up with at 7:30 in the morning on my way to work. Fortunately, I think I bought myself some time, so if anyone has any advice on how to appropriately explain the miracle of life to an almost 4 year old little boy I would be happy to listen :)