How do you store your breastmilk in freezer? My 2 months old baby girl drinks 4oz per feed. I can pump only 2oz per session. So do I combine milk till 4oz per bag before I transfer to freezer?

I don't. I will store in another bottle and wait till the fresher one is cold then combine with the other cold ones. Temp difference will cause bacteria to multiple v fast. So I only combine when they are of the same temp. :)