I know the label can be very hard to swallow, but it does give us important information that will be very useful to you when times get tough for your son, as they are, unfortunately, likely to. We don't have too many schools eager to pass out a label of Aspergers so if the school came up with it, I would assume they had good reason. Honestly, I think we've got the best kids in the world. Their minds are so interesting, and lots of segments of our society are willing to embrace that. So .... maybe your son will have a hard time fitting in a normal classroom, and maybe he'll have a hard time fitting in on a sports field, and maybe he'll have a hard time enjoying parties with his peers ... but there are plenty of places he'll fit in beautifully and thrive. The trick is learning to discard any notions you or those around you have of what should make him happy, and help him find his own place. Your road has changed, but it hasn't stopped.
As someone pointed out earlier, Aspergers is not something kids grow out of, although they can learn to compensate for the limitations and become adept at hiding some of the AS behaviors like stims (if necessary). I pick my battles carefully with my son on what he should learn to hide and what he needs to compensate for; he is actually really comfortable being who he is, and doesn't care if he fits in as long as he isn't teased. Some things, though, I have to teach him the connections - that he may not care about X, but failing to learn it will hold him back on Z, and since he does care about Z ... And so it goes. He, too, is really smart, but it comes with areas where he is brilliant and a few where he is extremely impaired, and that is all par for the course. What we want is for our kids to keep moving ahead in school based on their overall talent, and not held back to deal with the areas of impairment; that is why you need an IEP and special services, for the IEP will allow the school to support the areas of impairment separately.
Many people believe that Bill Gates is AS, and that Thomas Edison was, as well, among many other famous and historical figures. Silicon Valley is considered to be filled with AS. So, all that quirky brilliance will have a place in the adult world if we allow our kids to develop their talents without squashing that all in favor of the window dressing of life. As parents, we are constantly seeking the balance, and it is no easy task. But ... I wouldn't trade my son just as he is for anything.
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).