and some numbers eg up to 10 with little effort other than reading to him when have time or pointing things out on the way to the park etc. I'm not sure this means anything but we've been a bit surprised how early he's been interested and I suspect a lot of it is having a 6 year old sister who's shown him letters phonetically etc and enjoys her homework!
He's way 'behind' where DD was socially at this age as she very interested in other children much more already but he's very attached to her and is pleased to see some of her friends so I guess I mustn't worry. And he is absolutely fascinated in lights being on or off, things being dark or light to the point of which it feels it's literally all we discuss? Hopefully this is just that he's working it out? (My dad thinks he'll grow up to be an electrician!)