In other words, if you have 1 ounce pumped, cool it and add only that ounce to the frozen supply. Only add cold milk to cold milk or cold milk to frozen milk. Because you never want to waste breast milk, you might consider freezing it in relatively small amounts. This way, if your baby doesn't take it all, you won't be throwing it out. BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world.
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Learn more about our editorial and medical review policies. Mayo Clinic. Join now to personalize. Photo credit: iStock. These factors make it difficult to recommend exact times for storing breast milk in various locations. If you live in a warmer climate or keep your home at a warmer temperature, you should place breast milk in the refrigerator if it will not be used within a few hours.
Breast milk does not spoil as quickly at cooler temperatures. If your baby did not finish the bottle, the leftover breast milk can still be used within 2 hours after the baby is finished feeding.
After 2 hours, leftover breast milk should be thrown away. To avoid wasting unfed milk, consider storing, thawing, and warming milk in smaller amounts. You can count the age of the milk from the first time that it was frozen, regardless of when it was moved.
Moving frozen breast milk between freezer locations should be done quickly to ensure that the milk stays frozen. It may be useful to pack the frozen breast milk on ice packs while transporting the milk from one location to another. After 4 days of refrigeration, your breast milk should be used or thrown away. Breast milk has properties that slow the growth of bad bacteria. These properties begin to decline after a few days of refrigeration.
Mixing freshly expressed breast milk with already cooled or frozen milk is not advised because it can rewarm the older stored milk. It is best to cool freshly expressed milk before combining it with older, previously cooled or frozen milk. It is also important to consider storage duration guidelines for breast milk. For example, if combining cooled milk pumped on different days, the duration of storage should be based on when the older milk was first stored. Your breast milk may still be safe, but it depends on how long the power is out and how defrosted or warm the breast milk becomes.
Freezers, if left unopened and full during a power outage, will keep food safe for about 48 hours about 24 hours if half full. When freezers are full, the other frozen items help keep the freezer colder longer. The refrigerator will keep food cold for about 4 hours if it is unopened. Hear that, moms? In fact, you can grab this same bottle three hours later and continue pumping into it. The Academy of Breastfeeding Medicine ABM warns against adding newly pumped breast milk to chilled milk ; this warms up the cold milk and invites the growth of bacteria.
To combine the portions, you'll need to pump into a new bottle, then refrigerate it and mix it with the older milk when it's cold enough. Refrigerated milk can be safely used within a 4-day period; depending on your baby's preferences, you can feed directly from the fridge, or warm it up in lukewarm not hot water. Same goes for milk that you've already stored in the freezer after pumping. If you want to add fresh milk to a frozen batch, the safest approach is to thaw the frozen breast milk by refrigerating it or putting it in a warm-water bath, then pouring in the new milk once the frozen milk is at room temperature.
Again, you'll need to pump the fresh milk into a new bottle, so you can't use the frozen milk bag or container for another pumping session. The CDC guidelines caution that moms should never refreeze breast milk that has already been thawed.
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