Hello all, my son has been diagnosed with "failure to thrive" basically because of bottle refusal and not being on solids well. He is at the 3rd percentile. We have been on 24 calorie formula with duocal added to every bottle. He is only averaging 10-12 ounces formula per day and 1 jar of baby food. We were told to add things like oils, butter to food. How much is appropriate for formula and what works best.