Need more help with bottle feeding breast milk

[AraaniSwift]

(So my mam bought me a steam steriliser in the end) anyway I've been managing to express and save my milk in the fridge quite well, I've been saving 120ml (sorry don't know what the conversion to oz is) last couple of times I've given him a bottle he's drank most of it quite well but then he's brought a lot back up, I'm not sure if it's like reflux or if a burp is pushing it out (I can't hear a burp but it does come out quite fast) can anyone shed any light on this? Am I giving him too much? Surely he would stop drinking if he was full?
I do t want him on the bottle exclusively but I would like him to be able to take the odd bottle in a day so my husband can look after him while I have a little me time (ie a longer bath instead of a quick rub down lol)
Thanks

what teat are you using?

could you use a slower one?

babies quite often take more than thet want from a bottle because it comes out so easily and it's difficult for them to stop the flow by themselves

i would try giving a bit less and see how you go

He is on the slowest teat there is, he doesn't seem to struggle with it, when he is drinking he doet the same as when feeding from my breast a few sucks then a pause.
If I try cutting down the feed how much should I give him?