HOw many days did you see the result on the Nutramigen?. I was like you, From regular Enfamil then Gentleease but after 3bottles of 4oz. of gentlease my baby screams and he is gassier and fussier than when he was on the regular enfamil. I called their customer service and they told me it takes 3-5days to adjust and since I dont want to see my son suffer I decided to just switch back to regular enfamil. They will also send me a Nutramigen, hope this can help me.