M.M.
Could bee the formula. WIthout background, it is hard to know. I guess I would call the peds and alert them. It could be as simple as switching to another formula. Trust me, if they have fortified your formula to 27 calories, the calories are needed and they are not wanting him to cry and use up so many jouls of energy and kind of defeat the purpose. Call the pediatrician or your feeding clinic if you are working with one.