Hi Rach, sorry your having hard time with it, Who knew chosing a formula would be such a pain. Jayden seems to be ok now, had settled down alot more, is still a bit wingy but nothing like he was, maybe he just didnt like the switch over. Plus im making sure hes getting 2oz of cooled boiled water so he doesnt get constipated. Your HV may say try a hungrier formula in maybe aptamil or cow & gate. Good luck