Whenever I give a young niece or nephew some bitcoin, I actually just give them this physical coin, but keep a separate wallet for them that I load up on birthdays.

Then when they turn 21 I'll give them the seed.
 https://image.nostr.build/9e4eaff0a85e8402765798d41226fba943d2a155b4047238eb5ef9ac18100f1f.jpg