Doing an awesome power-slide in your car landing perfectly in a parking space, the driver then turns to the passenger and exclaims "that's how babies are made!"
Babies are made when a man puts or injects his penis into a womans vagina while pushing & pulling without using a condom. But you should not be asking me this you should be asking an adult.
Son: mommy how are babies made
Mom: well hon when a man puts or injects his penis into a womans vagina while pushing & pulling.
Son: oh thank you mommy now I know