No harm meant, my opinoin is start a kid out with a 20ga.. They will accomplish so much more.
I think buying a small youth a .410 to learn to shoot with at tin cans, clays, etc. might not be all bad. Get them use to a little recoil and gun handling and then work up to a 20 ga. with some light loads. But don't send the kid after pheasants with a .410.
That's what my dad started me on. H&R single 20. Kicked like a mule though
.410's are fine for skeet and clays, where even a slight hit counts. For birds, not so much.
The reason I even brought it up as one is because it's not unheard of for youngsters to start out on one here in SD.
I started hunting everything from pheasants to geese with a .410 when I was a kid. It taught me how to be a patient shooter. I haven't hunted with a .410 for pheasants in a while but if you are shooting pointed birds a .410 could get you just as many limits as using a 12 gauge for birds over 40 yards.