Aw mama, totally normal yan, 8 months pa lang at nasanay talaga sila sa lasa ng breastmilk kaya medyo mahirap mag-adjust! What a few of us tried is mixing the formula with your breastmilk muna (like 3/4 breastmilk, 1/4 formula to start), then gradually increase the formula ratio so hindi ganap ang lasa change, and honestly it worked para sa most of us. One of my mum friends swears din na mas okay kung warm and in a bottle (not cup) ang formula, parang mas natural ang transition para sa baby. Try mo ring mag-introduce ng formula during the time na hindi siya super hungry or super cranky para mas open siya mag-try, and be patient lang, may kapit-bisig ka sa amin dito, you're doing great!