If you'd like to add your most recently pumped fresh milk to a bottle of already refrigerated milk pumped on the same day, you need to cool it down. First, place the fresh breast milk into the refrigerator for 30 minutes to an hour. Then, once it is cool, you can add it to the other container of refrigerated milk.

Can you combine milk from different times?

Milk from different pumping sessions/days may be combined in one container – use the date of the first milk expressed. Avoid adding warm milk to a container of previously refrigerated or frozen milk – cool the new milk before combining.

Can I mix fresh milk with refrigerated milk?

You can add freshly expressed breast milk to refrigerated or frozen milk. However, thoroughly cool the freshly expressed breast milk in the refrigerator or a cooler with ice packs before adding it to previously chilled or frozen milk.