Discomfort while feeding

Hello! Recently, my 5 week old has been very uncomfortable while taking her bottle. Normally, she gets fussy halfway through and wants to burp but goes back is just fine. She now grunts and cries at an ounce and refuses anymore but she’ll latch onto the breast with no problem and minimal discomfort. She does spit up quiet a bit, especially if I don’t burp her in time. Any suggestions? I plan on getting gas drops to see if that helps. Pic of my sweet girl 🥰