Mine (2e with Asperger's) approached all his milestones in scrambled fashion. He could count and do some mathematical manipulation before he could really talk; he learned to say the ABCs before "mom," "dad," etc. He was a very early reader (again, not sure how early because he was a fairly late talker).
I would say that if you have developmental concerns, talk with a developmental pediatrician. They can do a nice job teasing out what's just unusual and what's something that needs to be addressed.
DeeDee
