My dd is nearly 9 months and is still not sitting independently or rolling over.She is a very long baby (10cm longer than average at 6 month check)and in the 91st centile for length.She has no evident hip or limb problems but just throws herself backwards if i try to sit her up at a 90 degree angle.She will sit supported by pillows but shuffles down to a 45 degree angle when in pushchair or highchair or on pillows.Anyone got any ideas/opinions am I being paranoid?My ds who was a "normal" size sat at 6 months.I know they all differ but am beginning to worry a little.Any comments gratefully received!!