I'm right handed, left eyed...Clear up into my teens my dad made me shoot right handed.. He didn't know either, we both found out I was this way during our hunters safety class. I'm 51 years old now. Anyway...Because he made me shoot righty for so many years I'm almost 100% ambidextrous shooting firearms. Especially with pistols. When I bird hunt waterfowl, I shift hands depending on the birds approach. During tac courses with pistol I shift the entire pistol to my other hand for weak-side shooting. For long shots with rifle, lately I've been shooting righty, but in a rush this year I got my buck lefty proned out on the ground. I didn't notice til after the shot I'd done it lefty. I shot my cow righty at long range off bags. So don't sweat it. I'd let him decide what's confortible...hell he's just 4.5. Let him run around with BB guns and toys and watch what's confortable for him. It's no worries, just practice for him later on.-WW