My lo is 6mo. He is ebf but we did use some bottles of expressed milk in the first couple of months to help put weight on. I’m preparing to go back to work so need to move him onto formula (don’t want to start pumping again as it took ages for me to be able to stop before) I’ve tried different bottles, different formula, cups (he does sip a little water from a cup now) and even tried some expressed milk from the freezer but he just screams and arches away . Does anyone have any tips?!