I've sat mine up as they've been so keen to do it, but I've also read it's better to let them get there themselves. They will, once they start moving they figure out how to push themselves up into a sitting postiion. I think it proably is better to let them figure it out themseves. Don't worry about the 7-month thing, as with all things they do stuff at different rates - he's moving, so he's still doing more or less what he should be.
My girls both sat up at 5.5 months but DD1 didn't crawl until 10 months. One of my friend's little girl crawled before she sat up. I don't think she sat up until about 8 or 9 months. Just see how he goes. It sounds like he's trying and his muscles just need to get a little bit stronger before they can support him fully. Slouching is pretty normal to start with at first too. I wouldn't push it too hard. He'll get there. If you are worried, talk to someone who is qualified to comment. No offence at all to the gymbaroo person but I wouldn't be taking comments from them as gospel x
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