Cold milk?

Is it a bad thing to give my baby cold breast milk ? We have to pump and bottle feed due to latch issues from day one - we tried a shield with no luck. The bottles work best for both of us. I was originally taking the bottle out of the fridge and letting it get to room temp then feeding - well he started spitting practically ALL of it back up each time. I tried a couple cold bottles and he hasn't spit any of it up ! Is there a difference between warm and cold milk ? He's 2 weeks old if that makes a difference !