Where do babies come from?

How do you tell a 5 year old where babies come from? I was always told by professionals and books to be honest and age appropriate about it. So up till now, I have told Joey the basics... He has watched a video (that did not show nudity or the birth of course) about the developing baby in utero to birth. He was educated that the sperm from the Dad fertilizes the egg from the Mom and on from there.

One thing you have to understand about Joey is he can tell when you aren't giving him the facts and he is scary inquisitive! As you can tell, I don't have any other options but to be honest. Besides, I don't believe in the alternative.

LUCKILY, he has not made the connection as to HOW it all happens in the first place.. haha!! Last night was the first time he asked. I think my heart stopped and I just laid there frozen, not knowing what to say. "Mom, how does the baby get inside the mom in the beginning?"
Ummmm.... finally I thought, "From the Dad." Scared out of my mind what would come next he goes...

"OH Yeah, the sperm!"
"Right." I said...
I can breathe!... he still didn't make the connection and to avoid the chance of him asking, I quickly changed the subject.
So far it has been diverted, but for the time being I will get educated as to what a child should know and how they should be told.

Whew! but his reply cracks me up.... too much!