Must have a been a pretty bright light that he needed to wear a hat.
He's turning into one of those kids that worries about looking cool. And he's only 10.
I would tell him to enjoy the hair and not cover it up, judging by dad (no offense implied) it isn't long for this world.
Oh yeah, it is coming. Both his dad's and mom's sides are full of bald men.
When do you have "the talk" with him about his likely future baldness?