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This is a complicated area, and there's virtually no science in this field - just lots of speculation. (This is true of most psychology).
I'll give you my take on all of this from what I've been able to glean from the tiny bits of actual science that are out there. I'm not a doctor, but I am deeply involved in medicine.
There is an actual disease called autism. 80-90% of victims of this awful disease have mental retardation, and a raft of other distinctive behaviors, and typically either don't care about interacting with other people, or hate interacting with other people. The fact that your son wants to interact tends to indicate that he's not autistic.
Beyond true autism, there is allegedly an "autism spectrum" - people who supposedly have some degree of autism. There are even "official" labels for some conditions on this supposed spectrum - PPD-NOS and Asperger's Syndrome are two common ones. The short story is that, despite what everyone hears these days, it's not clear that an "autism spectrum" exists. 1. it hasn't been proven using anything resembling science 2. it very difficult to get two clinicians to give the same diagnosis - one might say a kid has PDD-NOS, a second might diagnose the same kid as having Aspergers, a third might say the kid's fine. 3. it's currently the diagnosis du jour - almost any kid that's "a little different" is getting labeled as having an "autism spectrum" disorder. If you go to some autism services, say, Children's Hospital in Boston, they'll label a potted plant as having some degree of autism - it's the "in" thing to do. 4. There's no treatment that's been shown to change outcome.
Also note that as of a few years ago, there was only one test that had been shown to have any predictive validity for future "autism-like" problems when used in toddlers - the MCHAT (Modified Checklist of Autism in Toddlers, I believe). When used on a young child, predictive validity is the only thing that counts - that's what tells you what your child will (or won't) become, not what he is now. .
For whatever it's worth, if it were my boy, I'd take him to a few doctors - say a pediatric neurologist, and a good pediatrician or two or three. Psychology on a toddler is really a stretch - probably not useful until he's five or so. Try to go to a teaching hospital. And always be suspect of psychologists - there are some good ones, but most deal in wild guesses - even at teaching hospitals.
Good luck! Most problems turn out to be nothing - just kids being kids, developing along different paths - they all tend to converge at about five, before that they're all over the place. But do get it checked out, particular the physical issues.
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