Heat a Baby's Bottle - Dispose of any clear plastic bottles and replace them with opaque ones, since some studies have indicated that chemicals may leach from plastic bottles made out of polycarbonate.
Defrost breast milk if necessary, either by thawing it in the refrigerator overnight or putting it in a bowl of warm water for half an hour.
Heat a Baby's Bottle
Warm a bottle of either formula or defrosted breast milk by submerging it in a bowl or pan of warm (not boiling) water, by running the bottle under warm tap water, or by using a commercial bottle warmer, available at baby stores.
Test the temperature of the milk or formula in the bottle by shaking a few drops onto your inner wrist. It should feel tepid, not hot.
Continue warming the milk or formula until it's the desired temperature.
Whether they take breast milk or formula, some babies prefer having their bottles warmed up. It takes off the chill and generally helps infants accept the bottle. - by eHow
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