Fussy after every bottle feed

Vanessa • Married to the most wonderful & handsome man in the world! 👧🏻💞 born Oct. 23. 2016 & 👶🏽💚 born May 2. 2018 ♥️IG: DwyerBearFamily
When our baby girl is hungry and say we are feeding her 3oz, we stop every once to burp her and as soon as we take out that bottle from her mouth she starts crying and crying lol and when we put it back in she is fine. Why is this? She will be 7 weeks tomorrow :)