Bottle feeding troubles HELP!

Hi mummies, It has been really difficult to feed my 2 month old baby recently. Baby drinks expressed breast milk. He fuss and cry when drinking and it’s really stressful and difficult to feed him. My husband and I will put him on shoulder to let him cool down and burp him in between the feed. But baby still fuss and gets angry whenever we continue feeding him. Sometimes unable to finish the milk. Any idea what’s the cause? (I tried to introduce new bottle but he’s still the same.) #advicepls #firstbaby #HelpingaMom Thanks!