Breast milk is not suitable for repeated heating. If the mother produces a lot of milk and there is a surplus for the baby, or when the mother is working or out of town, etc., the milk can be expressed and put in a special milk bag and stored properly refrigerated in the fridge or in an ice pack. Breast milk needs to be heated with warm water to about 40 ℃ before feeding the baby, but it is recommended to prepare the milk to grasp the amount of milk, try to ensure that the baby can eat the case of a small amount of residual, the remaining milk can be discarded, and should not be repeated to save, repeat the heating, or else it is easy to make the milk nutrient composition is not stable, and it is easier to make the milk contamination, bacterial growth, etc., which will bring gastrointestinal tract to the baby, or even gastrointestinal tract infectious diseases. Even gastrointestinal infectious diseases.