You can add freshly expressed breast milk to refrigerated or frozen milk you expressed earlier in the same day. 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.
Also asked, can you add breast milk to already pumped milk?
You can continue to add small amounts of cooled breast milk to the same refrigerated container throughout the day. Avoid adding warm milk to already cooled milk. Pumped milk may be added to frozen milk provided it is first chilled and the quantity is less than what is frozen.
Can you combine breast milk from both breasts?
Storing your breast milk: Combining milk. If you pumped both breasts at once and the total amount of milk obtained will fill one bottle no more than two-thirds full, you may combine the contents in one bottle by carefully pouring the milk from one sterile container into the other.
Why you should not shake breast milk?
Don't Shake the Milk. Because shaking expressed mothers' milk (or boiling or freezing it) denatures the shaped molecules of the protective proteins, leaving only the pieces - the amino acids - the parts. Even broken up, the separate amino acids are still really good stuff and are digested by the baby as nutrients.