Thx for reply--
I'm all for a snowboard specific boots- just can't find them that small. How functional is a boot really going to be if it's super loose or has several layers of socks to make up for 3-4 sizes? I don't want to risk any injuries.
Having thought about this a bit more, I think that burton avenger is probably right, it won't matter much if it's a non-snowboard boot, expecially for a kid that's barely three, he'll be only on really easy slopes I suspect.
It's also a matter of degree, if 11 is the smallest size and you're kid is barely fitting into a 9 then you're probably better off with a proper snowboard boot. If two pairs of thick socks would work then I'd go with the snowboard boot.