There are, no doubt, better quality made l'il rifles for the l'il folks, but I think the Chipmunk/Crickett rifles are best bang for your buck, hands down
picked up a black stock Chipmunk a few years back for 1st born great-grandson, and it has seen it's share of range time
(not made anymore, name bought up by Keystone, was a bit better quality than the Keystone flavor)
picked up a pink stock Crickett couple years ago for 1st born great-grandaughter
she is just two now, so it's waiting in the safe for her
I set 'em both up with millet SP1 red dot sights, easiest thing for little beginners to hit with, and nothing beats hitting the target for fun factor. We have plenty of other fancier rimfires for when they grow out of those, and they do grow out of 'em fast, but it's well worth it.