Teats aren’t refrigerated.
It’s funny how many people love cold milk but won’t drink it when it’s warm. I tease people that make faces at the thought of drinking warm milk by pointing out that it doesn’t come out chilled.
Everybody’s first taste of milk, whether from a breast or a can, is warm.
For the record: I find a cold glass of milk very refreshing; I just don’t mind if it gets warm.