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Breast milk is only good for about 24 hours after thawing, so don't freeze more than one day's worth of milk in a single container. You can store your milk in special freezer bags or freezable bottles--two to four ounces is best for each container. If you're using a container, choose a glass or BPA-free plastic container with a tight-fitting lid. If you're using bags, avoid using normal storage bags or bottle liners. Choose bags designed for freezing breast milk. Even when frozen, breast milk will not last forever. Don't use breast milk that has been frozen more than three to six months old. Labeling your milk will help you make sure your baby is getting good milk. Store new milk in the back of the freezer where the temperature is more consistent. This will also help ensure that the first portion you use is always the oldest. Make it part of your nightly routine to take the next day's portion of milk out to thaw. That way you won't be stuck without milk and you won't be tempted to thaw the milk too quickly!
Store milk in small portions. Label milk with the date. Keep the oldest milk in the front of the freezer. Take milk out to thaw nightly.