Thanks for your suggestions everyone, there's some good ones in there. I think I will try asking him, 'Why do you think?' I have tried this a few times, but not often enough.

I do like that he's curious (he must take after me in that regard, I like to know everything that's going on, whereas DH couldn't care less about what anyone else is doing!). Frangipani Lou, we are planning to send him to kinder next year. I hadn't thought of it as a good sign that he is ready to learn!

I think what I most need is to practise some patience!