The temperature of the milk warmer is almost always constant and controllable. The length of time to store breast milk using a milk warmer depends on the temperature regulated by the warmer. The constant temperature of the milk warmer is almost always 37℃-39℃, and controlling the temperature within this range can basically ensure that the breast milk is fresh for 2-3 hours. However, if the temperature adjustment of the milk warmer is too high, such as over 40℃, the stored breastmilk may become sour for a short time and the freshness of breastmilk will become less, so the storage time over 40℃ is relatively short. Usually, the lower the temperature of the milk warmer, the longer the storage time of breastmilk will be. In order to avoid diarrhea, it is recommended to drink the breast milk stored in the warmer within 1 hour to ensure the quality of breast milk and to facilitate the baby’s absorption. If you want to keep breast milk for a longer time, you can put it in the refrigerator or freeze it properly.