Each child is different and it is very important for everyone's mental health to remember that. My son did not speak much at all. Then when he did speak, it came out in sentences. (I don't recall his age because he is 12 now). When he was in day care the teachers took us aside and let us know that they thought he might have a social integration problem (they did not say autism, but I think that is where they were headed) because he preferred to play by himself and he seemed to be really focused on certain things.....We were shocked for about five minutes and then realized that this was just who he was. He is still the kind of person that can be totally oblivious to the world when he is interested in something. In fact, I think he is just more of an introvert, as am I.
When he was an infant he never crawled, and other moms told me that he would have reading issues...then he learned to read at four, and other moms would freak out and either ask me what program I was using because they felt like they should be doing the same thing or would slyly accuse me of "forcing him" to learn too young. Seriously, sometimes I thought I was in this weird trap of the competitive moms. I would either try to downplay what he did because sometimes they would talk in front of their kids in a not-so-nice way about their own kids OR they would somehow be criticizing my parenting skills in a cryptic way. The truth is, with reading, that he liked being read to and we are both teachers so we are always reading and he wanted to be like us. Our second son was completely different. He loved music, so he was banging on drums and listening to music instead of focusing so much on books. He didn't learn to read until first grade.
I am rambling, but what I want to say is that moms talk about their kids in ways that can be so unpleasant....as in everything is a reference to some imaginary competition that only they know the rules for. I am sorry I am not answering your question well. I wanted to answer it because I can really relate to it. There is one mom that I particularly struggle with as are boys are friends and she says these really unkind, frenemy kinds of things, but they are totally about pitting her son against my son. It makes be unbelievably pissed. But I don't every say anything because, well, I don't want to be like that. Focus on your son, who is exactly that, a wonderful, unique child, just like all of our kids. I think you are already doing that because of how you talk about your son, but I know what it feels like when you just want a bit of reassurance...which I totally, totally can relate to.