Breast milk is not recommended to be refrigerated directly inside the bottle, because the bottle is not sealed, there are small holes on the nipple, if it does not meet the requirements of sealing, using the bottle in the refrigerator will affect the quality of breast milk, easy to contaminate, and can not achieve the effect of freshness. If you want to keep it in the refrigerator, the best way is to use a milk storage bag. After the milk is collected in a milk storage bag, the bag can be sealed and can be placed in the refrigerator or frozen after it is sealed. Because of the good sealing, it is convenient to take out the milk storage bag for rewarming. You can directly soak the bag in warm water to rewarm the breast milk, which does not affect the nutrition of breast milk and is also convenient for family members to operate, so that the child can have a good breast milk in time.