Using freezer stash

tngrl3

I go back to work on Wednesday and I plan to pump at work. My little guy was in the NICU for 2 weeks when he was born and I built up quite the stock pile then. He still typically only nurses from one side at each feeding so I pump the opposite side a couple of times a day and get about 3-4oz each time. My question is when I go back to work should I start incorporating frozen BM or just stick with feeding fresh or use a combination? I have never had supply issues so I hope to be able to pump enough at work to provide for each days feedings. Currently at 11 weeks old he takes about 3 oz at each feeding if we give him a bottle. Any input is greatly appreciated!