Don't Make These Thawing Mistakes
Although microwaving the frozen breast milk or putting it in boiling water can hasten the thawing and defrosting process, this can also damage the nutritional content and enzymes in breast milk and can even overheat it. You still want your baby to get all the nutrition and benefits that they can, so steer clear of this method.
A good rule of thumb to observe when it comes to thawing frozen breast milk is to refrain from freezing it again. Besides increasing the risk of bacterial growth and thereby making it unfit for your baby’s consumption, you run the added risk of further breaking down the nutrients in it.