My baby used to be like this as well. She used to vomit all the milk out (Merlion vomit) after drinking and eventually she choose to cry and not drink any milk. I resorted to feeding her while she’s sleeping and since baby is natural sucker she will drink finish the milk (breastmilk or formula) while asleep. In fact if you give your baby both breastmilk and formula since birth, they won’t be picky with milk. However do remember that breastmilk and formula cannot mix in one feed. So for my case, I feed her breastmilk during the day and formula during the night so that everyone can sleep better and at the same time my baby will get used to formula once I wean off breastmilk. Keep calm and you will get through this stage. 😊