B is 21 months, and can be stood holding the bloody ball, and will still put it down and get me a doll instead if I ask her to bring it to me!
Yes, some are capabable of things like that - if they have older siblings then they seem to do those type of things earlier than others.
I gave up looking at the books for when she was meant to do what a long time ago - I realised that she'll do things when she's good and ready, and not before regardless of how many times I show her the book! She is further ahead "for her age" in some things, but behind in others. If she's desperately behind by the time she reaches school age, or even playschool age then maybe I would consider checking it out, but they seem to all balance out by themselves by then.
You get the kids walking at 9 months, and then those who don't make any attempts until they are 2 - but by the time they get to school they are all running round the playground the same .
I think probably where he was poorly when he was tiny, you are probably more worried than most that something lasting could be wrong (I think we all worry to some extent). Just enjoy your little man, and get excited over everything he does - he brought you the chair, so you know he understands "bring"... baby steps, and he will get there.
xxx