Bong - my lad's on the autistic spectrum which is complex and there are many traits so no two cases are the same. He's fine for the most part, struggles sometimes to cultivate friendships but isn't obviously "odd" so hasn't copped any teasing in his 14yrs to date. He didn't say a word until a couple of months beyond his 2nd birthday, after that it was like a light came on!

Don't waste any time or energy worrying, instead invest it into spending quality time at every opportunity - it soon goes mate.