Breastmilk cannot be kept warm in a 45 degree thermostat. Breastmilk can be stored in a 45 degree thermostat for a maximum of 2 hours and cannot be fed to the baby after that. Because breast milk is rich in nutrients, it is easy for bacteria to multiply and deteriorate when it is at 45 degrees for a long time, which can cause diarrhea and other symptoms if the baby drinks it. Some moms choose to breastfeed, but because of work and other reasons can not always feed the baby or the amount of milk more baby can not finish, you want to extract the breast milk in advance for storage, so that the baby hungry feeding. However, it should be noted that: 1. low temperature preservation: if breast milk needs to be preserved, it is recommended to use a clean container in the refrigerator to refrigerate or freeze it. Therefore, the frozen breast milk should be heated at room temperature, and then the heated breast milk should be heated in water or 40-45 degrees with a milk warmer, and then fed to the baby when the breast milk temperature is around 40 degrees. If the baby is not finished in more than 30 minutes, it is not recommended to drink it again, otherwise it will easily lead to bacteria in breast milk and cause gastrointestinal discomfort after feeding it to the baby; 4. The mother can mark the time to express breast milk and the amount of breast milk on the storage bag or bottle to prevent the fresh breast milk from being mixed with the unfresh breast milk and to prevent forgetting the time to express breast milk and feeding the breast milk to the baby for too long, resulting in the baby’s gastrointestinal discomfort.