Breastmilk can be stored in a frozen state for about 3 months without deterioration, which makes it the best choice for parents to store breastmilk. However, frozen breastmilk can usually be stored for 4 hours after thawing and should not be consumed beyond that time. Frozen breastmilk can be thawed directly at room temperature or in warm water, and it takes about 1-3 hours to thaw completely. If stored for a long time, it can lead to deterioration or bacterial growth, which can cause diarrhea after consumption by babies. Even if you do not consume the thawed breastmilk, you should not put it back into the freezer. In addition, when storing breast milk, parents should try to use small portion bags and thaw and heat the breast milk according to the amount of food your baby eats, usually to about 40°C, so that your baby can take it as soon as possible.