Our ds is 4.5 years dx ASD and verbal dyspraxia in Feb this year. He started in main stream reception in Sept, he has a statement and lots of support - school have been fantastic.
I was so very worried about him starting school as he was non verbal - had four "words" but he does use sign, mainly Makaton, still in nappies, difficulty with loud, busy situations etc.
Considering his lack of speech he has very few tantrums and some previous difficult behaviours - biting, hitting, banging on windows - thankfully, have all been short lived.
Anyway, 3 weeks ago something "clicked" and he is suddenly trying to talk 

We were playing a counting game at home and he suddenly repeated "one" "two" he has never tried to copy words before.
Next day at school he counted up to ten. Obviously it's not clear speech - "or" for one, two is really clear
"eee" for three and so on.
But he will have a go at saying anything you ask him to, he is so pleased with himself.
The other major development is - he is out of nappies
we went for it and got rid of the nappies at half term and after a horrific first day, he got it, and from the Tuesday he had very few accidents.
So, he started back at school this week in underpants, and he hasn't had a single accident at school - couple of poo's in pants at home - no accidents at all today 
But his behaviour at home this week has been horrific, throwing tantrums - major meltdowns in the mornings, just before we set off for school ( once we arrive he literally skips into class and is happy to be there) also meltdown over getting ready for bed.
He is back to hitting me, throwing things - usually at me - being totally unreasonable.
This is so unlike him and I'm assuming it's because of all the major changes in his life just recently.
But they are all positive changes, so I'm at a loss as to how I can make it better.
Thanks for reading - if you got this far.