The same could be said of the mother breastfeeding her own premmie bub tho. Coz it takes trial and error to work out what in your diet could be affecting the bub (if it's the diet at all) and this could last the length of time that bub is in that sensitive early state. But ultimately the nutrients and antibodies etc etc are all still there and beneficial to the baby.

They're all valid points, but I think I'd still be inclined to choose breastmilk over formula for those early days for the premmy, regardless of diet sensitivities, because that can happen with your own milk anyway, and BM is digested so much easier, that it's sure to be better on their little tummies. That's what I reckon anyway