>>Did I mention that I think he is also going through puberty? He already has hairy legs and now he has hair down below....just one more specialist to see.
Seb, who is also 7 seemed to be experiencing precocious puberty. He's always been very hairy. In fact, when I was giving birth to Seb and pushing, the labor nurse said: "God bless him he's got a lot of hair". Now at 7, his back is hairy, his legs are hairy, I can see where his moustache hair will grow... and low and behold, a few months ago I spotted some fuzz in the pubic area. I was mortified.
I brough him to the pediatrician the next day and he sort of laughed at me, waving it off as The Hairy Gene (thanks to his grandpa). Basicallly the dr. said that fuzz isn't a concern on the groin or underthe arms. What would be a concern is actual adult type pubic hair. Not sure what variety your difficult child has, but perhaps this will ease your fears.