Breastfeeding mothers may need to send their breast milk out to be saved for their babies for various reasons, especially for working mothers, and it is a good idea to express the breast milk in advance so that the baby can still have breast milk while the mother is at work. The best way is to use a plastic bag for storing breast milk. Before putting the sucked out breast milk into the refrigerator or freezer, remember to put the date on the bottle or plastic bag so that you can keep track of the “production date” of the breast milk. Frozen breastmilk: 1. Fresh breastmilk should be consumed within 72h when refrigerated, but can be kept in the freezer for at least 3 months. If breast milk is placed in a separate freezer set below -18°C, it can even be kept for 3-6 months. After thawing, frozen milk can be kept in the refrigerator for 24h. 2. Although freezing will destroy some of the antibodies in breast milk, even frozen breast milk is still healthier than formula and can provide your baby with more ingredients to fight diseases. 3. When thawing breast milk, you can soak the bottle or plastic bag in warm water or put it in the freezer of the refrigerator overnight to thaw it, but make sure not to use the microwave to thaw or add breast milk, that will destroy the nutrients in the breast milk. The choice of milk storage bags: Milk storage bags: also called breast milk preservation bags, is a plastic product for food packaging, the main role is to store breast milk. The material of milk storage bags is mainly polyethylene, which is usually called PE, which is one of the most widely used plastics, some milk storage bags labeled material LDPE (low density polyethylene) or LLDPE (linear low density polyethylene) are a kind of polyethylene, but the density and structure is different, but there is not much difference in safety. When choosing a milk storage bag, mothers can refer to the following criteria: 1. Be sure to pay attention to the sealing of the milk storage bag, the sealing of the milk storage bag is of paramount importance, there should never be any milk leakage. 2. When buying milk storage bags, you must choose a regular brand and choose non-additive and non-stimulating products to avoid residues in breast milk that can be swallowed by the baby during the breastfeeding process. 3, carefully check the packaging of the milk storage bag, be sure to pick the product with complete packaging, to have the production batch number, if the printing is blurred or defective, do not choose.