sorry i don't have much advice to offer, all the kids i have seen (my own, at playgroup etc) all do things at different ages, some are slow to start off then take off and do heaps of things all at once, some hardly sleep at all others sleep alot)

but at the end of the day, you are your DS's mum, if you think something might not be right or even if you have a little niggle in the back of your mind, go see a CHN or GP that you trust and voice your concerns. its hard not to compare your child with everyone else. but if you think you want some reassurance then go get him checked out