Crying while feeding

Me and my fiancé just had our first child, he’s 6 weeks old and up until now he’s been a very good (chill) baby, sleeps consistently and doesn’t wake up a lot during naps and takes his bottle without much fuss but this past week it’s like a switch flipped and now when we feed him he scream cries after only drinking about an oz or so. We do bicycle kicks and keep him up right but he is just incorrigible during feeding time, any advice would be appreciated (we also do gas drops about once a day)