DS1 is 15 and has ADHD, looking back through my memories and video footage he had an awful lot of ASD traits - endless hours of 'setting things up' and examining each blade of grass and completely missing the roaring tiger stood in front of him, food exclusions to the point of being down to 3 items by the time he was 2.6, his language also was poor.
At the time i didnt think much of it, he babbled at the right time and did all his milestones early (sat alone by 5mths, walked at 10mths, missed out crawling altogether red flag if only id known , He was very advanced, as far as i knew. Then at 18mths when he'd managed a few words: mum, gamma, ganda, fitch (fish), we moved house and lived on our own... and he stopped EVERYthing, speech, smiling, playing... everything, he literally lived in a world of his own - i blamed myself, of course i would what had i done to this poor affected gifted child???
Anyhoo, to the point
he went for the very occasional speech therapy when he was 4, but it didnt help. He started to regain words again at about 3, but they were so poor anyone else but us couldnt tell a word he was saying. He only talked in odd words (with bits missing) and suffered terribly with echolalia (but didnt know it at the time). It drove me insane - he couldnt tell what he wanted but copied me endlessly. his speech did get better eventually... by around 5yrs. He can hold a conversation now, but often uses the wrong words, and is useless with intonation. At 15, i guess thats what hes got for life.
In short at 3 only echolalia, at 5 scrappy but barely understandable 3 or 4 word sentences that got his meaning across. and with progression to what we have now - conversation but with odd wording, and strange intonation. And if you're bored with the conversation he has to have it pointed out!
sorry to ramble, just had a lightbulb moment...