The BladeForums.com 2024 Traditional Knife is ready to order! See this thread for details:
https://www.bladeforums.com/threads/bladeforums-2024-traditional-knife.2003187/
Price is $300 $250 ea (shipped within CONUS). If you live outside the US, I will contact you after your order for extra shipping charges.
Order here: https://www.bladeforums.com/help/2024-traditional/ - Order as many as you like, we have plenty.
I second the My First Opinel idea, and also posit that the Mora scout knives with the double guard could be a good choice.
When you're ready to hand him a fixed blade, I highly recommend a Mora 511. It fits small hands well, has a finger guard and teaches good knife handling fundamentals. I've got one just sitting around waiting for my son when he's finally ready.
While playing around with my brand new SAK I did something silly and the thing closed on my right pointer finger - cut to the bone and severed a tendon!
I guess looking back I never made that mistake again but not fun for a kid...
With a kid's first knife, I give them the small swiss army knife with the knife, scissors, screwdriver, tweezers and toothpick (Classic I believe is the name). I put a lanyard on it and if a girl, they wear it around their neck, if a boy, they put it through the belt loops. This is to keep it from getting lost. Next comes the basic Leatherman multi-tool. You'd be suprised how many girls like this too.
A folding locking blade may get a child in trouble with a youth leader or the law.