New to pumping - question

CherryAura

To cut a long story short I was EBFing and yesterday I started pumping because LO has either decided she doesn't want to BF anymore, or her teething pain hurts too much to nurse. Not sure what's going on but she is happy to take a bottle and after a lot of crying from both of us, I've decided to pump.

I have no idea how much she takes so I'm expressing as much as I can and letting her have what she wants from the bottle.

My question is this, if she only drinks half the bottle, can I put the rest in the fridge and save it for later or do I have to throw it away?