DS1 is 3.5 and seems bright and articulate. However, he doesn't seem to recognise numbers or letters and sometimes gets mixed up between the two.
I read to him a lot, but haven't made any particular effort towards him reading etc. Up until now I've stayed away from any kind of focussed learning, apart from the usual stuff when we're out and about (recognising numbers in the lift etc). Should I be doing something about this at home? He goes to nursery 2 days and they haven't raised any concerns.