Schmickers has some good advice, there.
Also, I would absolutely recommend using a soft cloth sling like a HAB, or shoulder sling-type of carrier. DS was screaming in pain for weeks after he was born, until we were loaned a HAB...we never looked back. It wasn't instant, and once he realised that when he was upright in the sling it didn't hurt so much he got to love being in the HAB and within minutes he would be asleep. We also used Infacol (reluctantly) and a Brauers product from the chemist (stopped using Infacol when we found the Brauers one).