If I may tentatively post about DD2, who isn't diagnosed:
-At 4 months she suddenly seemed petrified of her crib. Arched back, wide eyes, screaming. We ended up co-sleeping.
-It took a year from when I stopped BF to wean her off co-sleeping. We had to use gradual retreat and the increments were incredibly small or we would have to start again.
-Very passive as a baby.
-Around 16-18 months got obsessed with a little piece of moon mat - had to have it rolled up repeatedly a certain way. Completely dissolved if it didn't get rolled as she expected.
-Around 20-22 months - had a dolly but instead of cuddling it she would just try and put a blanket on it. But the blanket had to be perfectly square and the dolly's bumpy bits stopped it being square, so DD2 would tear it off in a rage and start again.
-Some meltdowns at preschool - had to go and get her - preschool leaders said 'oh she's copying DD1.'
-Wouldn't wear a pair of shorts because they had two buttons and she was 3.
-Always, always on her own in preschool. No interest in what other children were doing at all. Not a single photo in her learning journal where she was with other children.
-Self-selected in Year R - repeating patterns, construction toys, etc., all concrete stuff. Didn't seem to gel with other children but was ok.
-Year 1 transition disaster - couldn't cope with change of classroom, change of table colours, change in expectations of handwriting, etc.
-Full school refusal and physical illness as a result of the anxiety. Had to pull her out of first infant school mid way through year 1.
-Year 1 at new school seemed 'ok' at first.
-Literal language, clear but relatively short-lived obsessions. No response to non-verbal communication, no response to tone of voice.
-Obsessed/tuned-in to parts of language ie. homonyms, homophones, etc., but doesn't comprehend more basic language.
-Now Year 2, falling apart at the seams. Not sleeping, huge anxiety, dislike of other children being around her. Not functioning in class.
-School now onboard and assessments planned with SALT, OT, Ed Psych, etc., with likelihood of CAMHS involvement early next year.