Question about thawing BM

stgn01

I've been pumping here and there to relieve engorgment, so I have some BM in freezer bags in my deep freezer.  I have one bag that has 4oz, but DS isn't close to eating that much in a feeding yet.  I've only given him bottles twice (I'm EBF) and each time he takes about 2oz.  

Can I thaw the 4oz bag in the fridge and do 2oz one night and the other 2oz the very next night?

I'm just not sure you can thaw the BM and have it in the fridge for more than 24 hours.  Thanks for the help.  This board is invaluable!