As heat can destroy precious nutrients, there are several methods recommended by the Cleveland Clinic and CDC. When you’re ready to thaw frozen breast milk, always choose the oldest milk in the freezer to prevent a decrease in quality. Your first option is to run the container under lukewarm water for several minutes. Avoid microwaves as they don’t offer even heat distribution.  For another defrosting method, you can also heat water in a pan and after removing from the stove, place the container inside. Before giving the milk to your little one, always test the temperature to make sure it’s not too hot. You can also wait for the milk to cool down to room temperature, though this may not be up to your baby’s preferences. Once the breast milk has thawed, make sure to use it all in one sitting, or within two hours.