Baby girl hasn't been too into her bottle today.. Every time it's time to eat she'll eat then I'll…

Baby girl hasn't been too into her bottle today.. Every time it's time to eat she'll eat then I'll burp her (she burps) then I try to give it back and she either acts like she wants it but then cries and spits it out or she starts crying as soon as it goes in her mouth. She eats about 5oz now but when she does this she's only had about 2oz.. Idk what's wrong she's been happy today not crying unless she's tired or hungry