Join Date: Aug 2002
Location: orbiting the earth
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Forgive me if I'm repeating - didn't have time to read the whole thread!
I also think it's a first-time mom thing...I found myself mentally comparing dd to other babies a lot myself. It was something I did more before she was walking, because there are so many milestones between birth and walking, KWIM? Rolling over, sitting up, crawling, first words, etc. - lots to compare.
Try not to look at those charts, unless you can find one with huge ranges of normal - like walking anywhere between 9 and 18 months is considered normal. Also, a lot of those charts are old and were created when babies slept face down, so they developed skills such as rolling and crawling at an earlier age. And keep in mind that as long as your son is progressing, it doesn't matter if he's the last one in the playgroup to crawl or wave hi or whatever. All kids learn to do these things, and once they are about two, you won't even remember who did what first because they all catch up!
As far as those "plateaus" - totally normal! I always noticed my daughter developing in spurts - like she'd stay the same for a month, and then within a week she would acquire ten new skills and seem like a totally different child. Once a child masters a new skill, they tend to focus on practicing it, and the other skills sort of fall by the wayside for a while. My dd was a very early talker, but tended to be on the other end of the normal range for gross motor skills.