Baby's not feeding as much as expected

Hello po.. Exclusive pumping po ako. Na nipple confuse kase si LO.. ayaw dumede sa akin.. Kya bottle fed po sya pro breast milk ko po denedede nya.. Kaso po lately d napo sya ganon kadalas dumede. 3 months napo si baby. Halos po 5 hours po sya na hindi nag dedede compared nong 2 months sya na every 3 hours talaga. And now.. Concern ako kase kahit 5 hours na nakalipas max 100ml lang denedede nya.. Minsan pinag lalaroan na nya teats nang bottle nya instead of concentrating to drink. Nag popoop nmn po sya.. Regular din ihi nya.. But he is slowly loosing fats po.. Is it normal po. D nmn po sya fussy.. And di rin iyakin.. Worried lang ako.. Kase baka ayaw na nya sa breast milk ko..