I’ve tried two different ones. Originally it started 2oz of formula & 5oz of bm but I’ve had to go up to 4oz formula & 3oz of milk. He did okay with it mixed at first but recently starting refusing. So I began to do them separate so the milk doesn’t go to waste & now he won’t drink formula at all mixed or not. My milk just keeps getting less & less.
try joining FB groups for your state for milk donation. it’ll be something like “human milk for babies (your state)”. we’ve gotten over 2000oz donated to us until we found a formula that’ll work!
have you tried a different brand of formula to see? and how much is the ratio you’re doing of BM and formula