Isabelle acts like I'm trying to drown her in poison when I try to give her formula cold but she doesn't mind room tempature. I asked the doctor if it was okay that I wasn't warming things and she said absoultely. It's up to the baby. She said to try cold, room temp or warm and see what she likes. (that's how I found out she thinks you're trying to kill her if you give it to her cold). I don't think there's a problem at all. :)
My son won't drink his milk unless it is ice cold and he does not have any problems. If your baby can eat with no problem than let him have it.
I don't think there is anything wrong with cold food. Unfortunately my sweet child refuses to eat anyting that is cold :) So, I suppose it would be ok for his formula to come straight from the fridge.