Donating breastmilk

I recently figured out my baby doesn’t take frozen milk well. He spits up a lot drinking it. We’re straight from the source (me) he doesn’t really ever spit up. So I’ve decided I want to start pumping at least once a day. So I can freeze it at stash it. Then donate to a baby in need! I exclusively breastfeed my baby now so I rarely pump anymore. But when I was I could make a 8oz bottle and a 4oz bottle in one pumping session.