I struggle to use my freezer stash and laugh at younger postpartum me for stressing about having a freezer stash. I now go by “feed the baby, not the freezer” mentality. I have about 200oz going to expire (will use for baths) and it’s quite sad I never used it after working so hard to make it. I also have high lipase and my milk takes like metal lol. I don’t know how my LO tolerates it.
If it was me, I would use the pumped milk to replace the formula and just use less formula. If still need to use some to supplement that’s totally okay! You just have to decide what works best for you and what will be the best use of the pumped milk! I wouldn’t want it to go to waste in the freezer if I saved it and ended up not using it. It’s completely up to you!