I learned what financial compounding is a LONG time ago: in essence, it’s using money to make money.
That’s why, over enough time, a small sum becomes staggeringly large.
Example: if the Indians who sold Manhattan had been able to earn 8% compound interest on the $24 they received in 1626, almost four centuries later they would have had trillions (true).
So, what’s “kid” compounding?
When your oldest kid is finally old enough (12) to meaningfully help out with your younger children.
Like today, when my son walked his 7 and 9 year-old siblings into day care while I waited in front.