Way to go MD. Teach them young and teach them right. No bad habits to break, less Hollyweird influence. From the looks of the target, I'd say he is getting the hang of things pretty well.
I started my son out with a .22 when he was 2. He will be 6 next month and has moved up to .243. It is great to have a hobby that you can share with your son, but it can get expensive. Totally worth it, though.
Oakville Shooter