The duration of breastmilk refrigeration is mainly related to the refrigeration temperature and environment in which it is stored, but it is recommended to leave it for no more than 24 hours after thawing. 1.0-4℃: breastmilk can be stored for about a week at this time, but it is still recommended to consume as soon as possible, the longer it is left, the greater the possibility of bacterial growth. 2. Freezer: Regular sealed storage can be left for a month to several months, depending on the local environment, and if left for too long, the nutrients may be lost and bacteria may grow, it is still recommended to consume as soon as possible. In general, no matter how long breastmilk has been frozen, it needs to be thawed and heated before feeding it to your child. Therefore, to avoid spoilage or contamination, it is recommended to leave it thawed for no more than 24 hours and to heat it at a temperature of 60 degrees Celsius or below. In addition, if breastmilk is frozen in the refrigerator, remember to label the date of storage and consume it within a standard number of days to avoid breastmilk harboring bacteria that can trigger symptoms such as gastrointestinal infections in babies.