Thanks girls.

I think with the head thing, I've been crossing the wrap at the front a bit too low, so its I think it must be loose and he's sitting too loo aswell, since I've started doing that, I've found that the straps are tighter and his head doesn't loll back (it was lolling back even tucked into the strap) so I think thats sorted.

As to the sore shoulders - I've got the straps spread out as much as possible across my back/shoulders, so not sure why its still aching. I can't get the bit that wraps round my waist that wide - maybe thats it. They always seem to bunch up around the hips.

Suse- thanks for that about bfeeding. So far, I've been just taking him out and leaving it tied up, which is working, was just curious if I could feed with him still in there - I know the ergo yuo can, but I'm guessing its a different sort of carrier. I'll check out the links though.