My dd also hypotonic and late in sitting, but I sat her in bouncer chair long before then and carried her in a sling a lot, so presumably that's what helped.
I understand what you're saying NAB, I just found your response very curt and focused on your experience.
I had a similar situation on another thread the other day, where lots of people were saying that their babies' failure to thrive turned out not to be anything serious- whereas mine was. Should I have got angry with them, just because their experience wasn't mine? It was upsetting to remember how things were for me and how much harder I had to fight, but I like to think that I still took the pains to respond gently to the other posters, and accept that other people's experience is valid to them. I also had to fight damn hard at the time (to save my baby's life, actually), but it doesn't make me angry with people who happen to mention that they've had a different experience.
I also regularly read threads where people are being reassured about their babies' failure to walk at 17 months. In our case, it did turn out to be the warning sign of a disorder that has left dd permanently disabled, so acting quickly would have been the sensible thing for us to do, but I do accept that this may not be the case for everybody.
Would have understood your response perfectly if I had said that OP shouldn't get her baby checked out, or that plagio is never serious- but I didn't say any of those things.
The quote from the Great Ormond Street seems to show that there are self-correcting cases, and looking at photographs of dd's head, it is clear that she had a very flat side to the head at 2 months, and that this is not apparent in photos of her at 10 months. I did the best I knew at the time for my baby, following the advice of health professionals.