My son is now 25 months old. 佢下星期五就會做評估! I think he has A-feature. He started his pre-nursery when he was exactly 24 months old. It seems that he got improvement on his 社交 skill after going to school. At least, he will line up to toilet / play area instead of 要老師抱住! We noted that his eye contact skill is better than before and sometimes he will play with other kids (but not always). However, it is still very hard to bring him to restaurant since he really cannot sit for a long time.
Thank so much for your sharing. Truly speaking, what I worried most about my son is his social skill and interest, more than intellectual or cognitive ability. From time to time I am so afraid that he'll be a lonely boy/ man throughout his life.
Anyway he's only 3 now. Really hope he can have good changes like your boy!