Although I haven't used an osteo, I have taken both my boys to a paediactric chiropractor and had great results. My first DS was a very unsettled baby and would only sleep when we held him. The chiro found that he had an undiagnosed dislocated right shoulder from birth and fixed him with some gentle manipulation. After a couple of sessions he was a new baby! He was much happier and settled.

I took my second DS just to get him checked over and the chiro found a few things that needed manipulation including his shoulder. I always finds he sleeps heaps better after we've been.

HTH