J.S.
How long can I keep the stored milk?
Amazingly, research has found that human milk stored in the refrigerator for eight days actually has lower bacterial levels than freshly expressed milk. For more details on recommended storage times, see Storage Times for Human Milk.
Since human milk can be kept in the refrigerator for up to eight days, it may be possible to provide your baby with fresh, not frozen, milk most of the time. This insures that your baby gets the maximum amount of nutrients and immunities. Instruct your caregiver to use the oldest milk first and keep the supply rotating.
Previously frozen milk can be kept in the refrigerator for 24 hours after thawing. This means that you or the baby's caregiver can thaw milk for all of your baby's feedings at one time, or you can thaw the milk in the refrigerator overnight. This can make it faster to prepare a bottle when your baby is hungry. Milk that has thawed should not be refrozen.