I have a friend whos daughter wasthe same as your little one and she ended up mentioning it to her chiropractor who treats heaps of kids and he did a small adjustment and within seconds her little girl could turn all directions. They dont crack the babies necks or backs but use what is called an activator and some massage to free things up.
You would have to call around though and find one who 'specialises' in treating babies and kids but I would definately wive it a go.
We had Victoria looked over by my chiro yesterday and she seems fine at the moment but aparently they recommend getting babies in pretty early, especially if it was a difficult birth etc.
Good luck!!