J.C.
I used a modified version of CIO that worked very well for my kids. when left for long periods to cry babies can get worked up or scared, making it harder to sooth. I used to wait 5 minutes, and than go in to sooth without picking them up or food. I would just lay them back down and rub their tummy or back and sing or talk softly until they calmed. If they started to fuss when I left I would wait 5 minutes and than go back in and repeat. By going in every 5 you are saying "I am here for you, but it is bed time and you will not get out of that bed". The first couple of nights may be long, but he will get it and it will be worth it in the end.