Store expressed breastmilk at room temperature for about 4-6 hours. Under normal circumstances, expressed breastmilk should be consumed as soon as possible and should not be stored for too long as it may harbor bacteria and spoil easily. At room temperature, for example, 25 degrees Celsius, expressed breastmilk can be stored for about 4-6 hours, and it is best to feed breastmilk to your baby within this timeframe. Once the breastmilk has exceeded the room temperature storage time, it is not recommended to give it to your baby again. If you want to prolong the storage time of breastmilk, it is recommended to keep the expressed breastmilk in the refrigerator, which can be stored for about 12-24 hours. If you keep the expressed breastmilk at room temperature, the preservation time tends to be shorter, which will easily lead to the deterioration of the breastmilk, which should be thrown away in time and can no longer be given to the baby. Therefore, be sure to check the color and taste of breastmilk in time to avoid giving your baby spoiled breastmilk.