I got my son a CZ 452 Scout .22 rifle. It is a kid-sized bolt action that comes as a single-shot (with sort of a dummy magazine in the magazine well). You can buy 5 and 10-shot magazines to convert it to a repeater later. It is a nice-looking, high quality rifle that is fun to shoot. I also put a compact Simmons 22 Mag scope on it. In addition to my son, I've taken boy scouts shooting with it, along with a 10/22 and other rifles. I expected them to want to use the semi-autos, but found that they seemed to enjoy the CZ Scout the most. I think they like the manual operation (I'm not sure why, but working the bolt and manually feeding each cartridge seems to appeal to them). They were also able to shoot it very accurately. It is light and quite small - a better fit for most kids (I was afraid it was too small at first, but now even I enjoy shooting it, and I'm 6'2").
I like the CZ more than some of the other kid-sized bolt-action .22s because there is no manual cocking knob to pull back for each shot. In other words, it works just like a "real" bolt-action rifle. The manual cocking knobs seem like an added safety feature at first, but upon further consideration, they teach kids that even after they chamber a cartridge and close the bolt, the rifle isn't yet ready to fire. I don't think that's a good idea.
While the CZ seems very well made, the bolt is a little stiff to work, and the cartridges need to be inserted with a little care to feed properly - not a big deal, but be prepared for a youngster to need a little practice to get the hang of it.
Doug