Asking this here because I'm interested in a child-led-learning perspective.
I was never planning to give my kid worksheets. Not when he's learning so much without them. Especially not at his age: not-quite 5 years old. I was sure he wouldn't have the patience to write numbers yet, in any case. But he was recently introduced to "number puzzles" somehow at grandma's, loved them, and wanted me to print more out. So I found a few free puzzles of various types online. And, though I told them they were "puzzles", they were also labeled as 1st and 2nd grade math worksheets! Eek. (I don't think he's that advanced -- the puzzles he did didn't require anything more than addition and logic).
From a parent's perspective, these have one huge advantage over baking stuff and math games -- he can do them by himself. Without 3 yr old sister messing things up, while I cook, etc... But I don't want to make things too formal too early.
Would it make more sense to just tackle that interest head-on and get some kind of sensible math curriculum he could use if he wanted? Continue with random internet worksheets? Or hope it'll peter out soon and lead him away from that stuff for another few years?
He's the oldest in his peer group, so none of them are in school. Therefore there's really nothing external driving this one way or another. He'll think math is whatever I say it is.