Anothr one with a ds just like yours, birdynmnums, reflux, dairy intolerance, non-sleeper, early crawler, early walker, non-stop explorer, etc. Which was quite a shock after two relatively placid good sleeper dcs. We used to say that ds1 was a non-standard model, dd the standard model, and ds2 the delux model "Now with Added Challenge!". His energy, curiosity and ingenuity are an exhausting nightmare delight.
It was clear from the earliest days that ds2 was very different to his sibs. For one thing, he had the happiest personality of the lot of us!
To an extent it is the child's personality and the best thing is to channel his energy, rather than try to control it. But I do think parenting has something to do with it, too. If ds2 had been our first, I think we would have coped better with him, and wold have been far more disciplined and consistent. But being the youngest of 3, it was often easier to give him what he wanted, so that he would be quiet and let me get on with getting the other two to school. Big mistake!
Ds2 has just finished his first term in Reception. His teacher (who is lovely, BTW) confessed at half term that she really struggled with him for the first few weeks, until she found the right challenges for him. He can still be defiant and buzzy, and gets up to mischief, but he is learning to co-operate, too. When he wants to (and this is partly what she meant by challenges) he can channel his energy into some pretty good concentration.
I asked what she does when he kicks off. She ignores him. Literally turns her back to him and gets on with something else. And it works, she says. I have spent some time in and around his classroom and seen how he behaves at school. I was amazed. And I have seen how he can change, as if a switch was flicked, when I collect him.
I'm on my 3rd dc, have read plenty of parenting books, put things I've learned into action, you'd think I've got it sussed. Uh-uh. Ds2's teacher has offered me a parenting course, and I'm taking her up on it next term!