My seven and a half month old son can crawl and has just started pulling himself up to stand. He's been able to do mini push-ups from very early (3 weeks!) and was rolling over very early on, commando crawling at about 5 months.
But he doesn't sit up! He just doesn't want to and can't do it without wobbling over. His head control is good, though (he's taking solids and sits fine in a high chair.)
Is this unusual? (First baby, as if you couldn't tell!)
Thanks, Ceebee74. I think I have been reading too many 'developmental milestones' sites. I didn't realise how different babies are- and how they do things at different rates. My image was one of linear development but that just doesn't seem to be the case...?