How To Warm Breast Milk Using Bottle Warmer. You should allow it around 2 minutes to sit there, properly sealed. (frozen breast milk can be thawed and then used in a bottle warmer.) the ideal temperature for a bottle of warmed breast milk is about 98.6 degrees fahrenheit since that mimics a breastfeeding experience.

For two hours if your breastmilk has been previously stored and thawed. Turn the heat off before it begins to boil, or your water may be too hot. If you are using bottles to feed your baby you may want to warm them.