I agree. If he has no absorbtion issues and is getting back where he is supposed to be I would cut out an ounce of duo-cal at a time....if your dr is BF friendly I would ask him his advice on how to transition. He may want you to come in for weekl or biweekly weight checks for a while to make sure his weight doesn't start to slope. I have never used duo-cal so if something I said doesn't make sense...that is why. I wanted to try to help with my experience with high calorie formulas though.