What's the best way to store expressed breast milk?

Using waterproof labels and ink, label each container with the date you expressed the breast milk. If you're storing expressed milk at your baby's child care facility, add your baby's name to the label.

Place the containers in the back of the refrigerator or freezer, where the temperature is the coolest. If you don't have access to a refrigerator or freezer, store the milk temporarily in an insulated cooler with ice packs.

Fill individual containers with the milk your baby will need for one feeding. You might start with 2 to 4 ounces (60 to 120 milliliters), and then adjust as needed. Also consider storing smaller portions — 1 to 2 ounces (30 to 60 milliliters) — for unexpected situations or delays in regular feedings. Breast milk expands as it freezes, so don't fill containers to the brim.