My DD is three and a half and has been flagged as possibly ASD since she was two and a half. We initially sought help with her speech as she wasn't talking, but we had no other concerns as she was engaged with us, her baby brother, our friends and was fairly obviously bright. A year later, her nursery and the educational psychologist still have concerns, we went through a period about six months ago where we were very very concerned, and now I'm leaning towards not being too worried again. It's a spiky profile, but we also discovered that DD has quite bad glue ear, so sometimes the selective hearing really isn't voluntary. DD could read numbers, count and add up/subtract by around fifteen months, but couldn't walk until sixteen months for example. She has perfect pitch and could sing nicely in tune by eighteen months, but couldn't sing the words. She has an interesting memory, with good aural and excellent visual recall, but no concept of time or yesterday. She struggles with transitions, but loves people, particularly lots of noisy excitable people. She can read and spell quite nicely, and has been able to since before her third birthday, and can write the alphabet with her non-dominant hand, but not her dominant hand. She talks more now, in whole phrases rather than building sentences using words, which is not a normal way of learning language. However, it's exactly how I did it and how her father did it (even to the point of practising words and phrases quietly to herself before using them). She's tantrummy, but when not tantrumming is easy peasy pudding and pie to be around and look after.
DS is eighteen months younger, two and three months and has damn fine receptive language and no expressive language. None. His three words are Mummy, Cake and Cuddle. They are of course the most important words.
Thanks to lots of lovely ham-fisted intervention by SALT, EPs and DD's teachers, I basically ignore everything they say about her. When discussing her entry to reception class (one week after her fourth birthday) her teacher said that she expected DD probably would be able to learn to read. She can. I've told them this. Repeatedly. They think I'm imagining it. I have given up and just let their well-meaning incompetence wash over me in a pink fluffy cloud. DH is better at coping with it for some reason. He has nodding and smiling down better. I have to resist the urge to make snide remarks and liberally pepper my comments with long words. Which DD can use in an appropriate sentence and SPELL.