Storing BReast milk

Jalinar

How can I store BM after pumping ! I usually use it right after pumping. Yesterday I pumped and put it in refregiter for an hour them leave it out so I can use it whenever baby wakes up. He woke up after 3 hours. I fed him after tasting the milk and it was fine. But I'm worried now. I should have dropped it. I'm really worried because the milk had fat layer on surface and it went after shaking it. But this happens usually even when it is in refrigeter. I dnk how to use the leftover milk since baby cries when wake up and I dont have time to warm it up. I even dont know when he will wake up so can prepare it