DD1 was an absolute shocker at this age and I was housebound so it was a complete nightmare - a full-on meltdown over nothing pretty much hourly for six months.

So. What could work? I have no definitive answers obviously otherwise I would have found something that worked for me .

But let's focus on bringing back a little sanity.

Firstly, lower your expectations maybe. You can't 'fix' this, certainly not overnight. It's baby steps, he's young and he's not in the listening to reason mode yet. He will get better as he gets older.

That means you have to find a middle way between indicating that you're not happy with his behaviour, not driving yourself nuts wanting instant solutions and not ignoring it either.

I'm wondering if he feels like there's a payoff for naughtiness because he gets attention. In that case, maybe more 1-1 attention throughout the day and when he bites/kicks DD1 just move him away without making a fuss and tell him no.