After breast milk has been refrigerated, it needs to be rewarmed properly before it can be fed to the baby, and the nutrition of breast milk should be retained to the maximum. There are several ways to re-warm breast milk: First, re-warm it in water, add 40-50℃ water to the container, put the milk storage bag into the water and keep gently shaking the bag so that the milk in the bag is evenly heated to about 37℃. Second, use a milk warmer to rewarm the milk. The temperature control of a milk warmer is precise, the milk storage bag is heated evenly and the rewarming speed is fast, so it is a more ideal breast milk rewarming device. Generally, breast milk is stored at a temperature of about 4℃ and must be rewarmed before feeding it to the baby, because too cold will lead to gastrointestinal discomfort or even diarrhea in babies, and too hot will destroy the nutrients in breast milk such as enzymes and proteins, so it should be rewarmed correctly when feeding frozen breast milk.