I'm a bit skeptical to be honest but have heard lots of people rave about CO.
DS has had 2 sessions so far and I'm not convinced there is any major difference. He does seem a bit calmer when he's awake but still wakes hourly at night and feeds constantly. His new calmness also coincides with recovering from an ear infection/cold etc. which I think is probably more likely to have been responsible for the improvement.
So, if it did work for you, how many sessions did you need ? DH in particular is not keen on spending money on many more sessions. I'm sure I'd heard that if there was no major improvement after 3 sessions, then it was unlikely to be worthwhile carrying on.
Would be grateful for your experiences