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Definition 1: when your girl gives birth to your baby but it's damn ugly, so you replace it with a baby that looks cute and not like a forty year old man.
Definition 2: when your girl gives birth but you're not in need of a baby so, you replace it with a baby of another race, blame your girl and dip.
DEF 1: Friend 1: "yo you've got a really cute baby, congrats!"
Friend 2: "ye thanks, it was nothing a little "Baby Replace Jutsu couldn't fix.""
Friend 1: "WHA-"
DEF 2: Friend1: " yo, where is your baby, I thought your girl gave birth?"
Friend 2: "ye, it's funny cos after a bit of "Baby Replace Jutsu" it turned out the baby wasn't even mine!"
Friend 1: "what does that mean?"
The first (or surviving) children you (or your spouse) have to replace you (and spouse if any) after you die.
We don't want to overpopulate the earth, so Jim and I plan on adopting after having our replacement babies, so after they murder us in cold blood, the world's population will go back to normal.