I pour in a microwave safe cup and pop it in for about 30 seconds. Then I swirl it around to make sure there’s no hot pockets and pour it in his bottle. 30 seconds is just enough to take the chill off without making it “warm” so he’ll still drink it.

I fill the sink with hot water and put it in there for a little bit.

Bottle warmer for a few minutes to get the chill off.

Following bc I have the same question. She doesn’t love it cold

Pour it in the bottle put it in the microwave for 30 seconds put the nipple on shake it and test on my wrist to see it's not too hot. You could use a bottle warmer I suppose but I prefer the microwave.