I was not diagnosed as a child. but what helped me the most was a VHS tape. I don't know where we got it (I think it was one of my mom's exe's), it was some sort of miss manners, modeling tape. It went through how to walk(toe-heel), what to wear, who shakes hands first in a given situation(elder first), how to hold your head/neck, how to sit correctly in a chair (as a lady), the appropriate things to talk about in social situations (i even know how to do a place setting for a full 7 course meal, how to hold the silver and what each piece is used for). I discovered it in our cabinet when I was about 7 and I must have watched it a bajillion times. It was fascinating, and it was something that, had I never found the tape, I might not have known that I really didn't know to do as I got older. I don't know if mom still has it, but if she does, i'll find the name of it and post it here. (it won't help as much for boys but still, the idea is there)
I advocate this, because a tape is cheap, won't stress a child, they can pause and rewind all they want to.
things my mom did that helped (now that I look back):
letting me hold pinkies instead of hands
buying me a book from walmart/dollar store whenever we went in (books-my main obsession)
tucking in "snug as a bug in a rug"
not freaking the first time i rearranged my room by myself (when i was
taking me to auctions/garage sales/bazaars and just letting us look
things my mom did that drove me nuts:
tickling me (incessantly)
cracking my knuckles
teasing me about the friends i did have
coming up and bear hugging me all the time
taking down stuff that i had created (twist-tie wall across my room- hey it had doorways)
Making me invite people over for my birthday (it's my birthday it should be for me)
Now I am of the mind that as a child, aspergians should be taught how to interact with other children/adults on their level, but it should not be forced on them that they have to all the time. It would have saved me a world of trouble to know I didn't have to feel guilty or wrong for not wanting to do what the other high school kids wanted to do with their free time.