Bili ka ng soft silicone ung nipple na bottles like pigeon, avent, comotomo, etc.. We also experienced this mommy.. di nya tinatanggap ang nipple, iinom xa pero konti lng talaga then he’ll play with the nipple na lng or iinom pero in between fussy xa as in hirap.. advise ko is bottle feed your baby constantly /consistently sooner or later, masasanay din xa.. give it a couple of days, wag mafrustrate agad.. we tried dropper feeding (success but super bagal matapos) so we tried cup feeding (mabilis xa pero madaming masasayang na milk) then eventually nagbbottle feed na xa ron :) it took as 10 days na consistent nagbibigay sa kanya ng bottle :) you can do it mommy!