Frozen breastmilk should be given to the baby within 4-6 hours after thawing. That is, it should be left for a maximum of 4-6 hours. If the frozen breastmilk is heated, then it should be given to the baby in time to finish, and should not be put back into the refrigerator or reheated for consumption. Normal freshly expressed breastmilk can be stored at -20 degrees Celsius for about 3-6 months. When storing fresh milk, it is best to choose small packages of packaging supplies to store milk, so as to avoid waste. There should be a separate space in the refrigerator when placing the milk, do not mix it with other foods to avoid contamination of the milk. It is best to write the start time of storage on each bag when storing, so that the baby can avoid eating breastmilk that has been stored for a long time.