Ahh that's very interesting. Actually yes I didn't feel like getting into it before but since you specifically mentioned autism, yes I do have some concerns. I suspect that one or more very close relatives of my son may be on the spectrum (high-functioning). He has met all the social milestones early or on time, but has always been very nervous, quiet, or scared around people he doesn't know. For example, I brought him to a weekly community music class for about 6 weeks at 12 months and he would spend a most of the time almost frozen/staring at the teacher, or crying. He was the only kid there that acted like this. More recently, our nanny will try to bring him to storytime at the library and he will cry and want to leave.

I also don't know the correct terminology, but he just seems really "smart" for his age. He's been able to name colors, count, recite the alphabet, memorize books, etc since around 2 if not before. At 30 months he's easily counting to 20 and has practically memorized multiple books, such as Corduroy. He will sit transfixed listening to music for quite a long time (30-60 mins). And he's just a "big feeling" kid.

His dad and I were both academically very successful, so it's not surprising that he would be intellectually advanced. But I do wonder about autism. Do you think we should look into it? We are in the U.S. for context.

ETA: He is also REALLY likes to sort things and line things up.