Storing Breast Milk

JKTTC1

LO is 3 weeks old and feeding every 3 hours. I pump 1 1/2 hours after feeding him. I generally give him one 3oz breast milk bottle each night so DH can take a feeding while I sleep. At 13 weeks I will be returning to work and DH will keep LO the days he has off and LO will go to daycare the other days. I want to start storing milk in a deep freezer but unsure how to g about it. Typically how many ounces will DS eat at 13 weeks? I dont know whats the best amount to store without wasting milk or bags. I can pump anywhere from 2-4oz between feedings out of both sides combined.