Expressed breastmilk can be stored at room temperature, refrigerated or frozen, but the safe storage time varies depending on the storage temperature. 1. Room temperature storage: Room temperature storage is suitable for pumped breastmilk that is intended to be consumed soon, and the general storage time is within 4 hours at room temperature. 2. Refrigerated storage: The time limit for storing breastmilk under refrigerated conditions from 0 to 4 degrees Celsius is 24 hours. 3. Frozen storage: breastmilk can be frozen at -20 degrees for up to 3 to 6 months, but you need to use a special refrigerator to store breastmilk. The door of the freezer should not be opened or closed frequently during storage. If the freezer temperature does not reach -20 degrees Celsius, the storage time of breastmilk will be shortened accordingly. Containers for storing breastmilk should be very clean, breast pumps and storage bags used should be strictly sterilized, and the time of storing breastmilk should be recorded. If you have any other questions, it is recommended to consult a professional doctor for guidance.