Divide by the average number of feedings in a 24-hour period. This will equal the amount of mother's milk per feeding. You're right, most of the time you will probably be able to feed your baby your refrigerated expressed milk. Even when using primarily fresh refrigerated breastmilk it is still wise to freeze some of your milk. Freeze in portions of between two and four ounces.
Many mothers choose to freeze their milk directly in bottles.
Be sure to leave one inch at the top to allow for expansion as your milk freezes. Top with a one piece cap. If you are adding fresh breastmilk to frozen, be sure to chill first so that you don't defrost the top layer of your frozen milk. Watch this report about showing affection to boys. Find out here.