I can't find any research on this, but what do you think is better from an immunological stand? I pump about 13-15 oz/day only and need to take some non-breastmilk-safe antibiotics sometime in the near future. So we are weighing the options. Currently I give 3 formula bottles at night and all her day feedings are breastmilk.

More bottles of breastmilk/day, but you run out by month 3 or so.

One 4 oz bottle of breastmilk/day, but you have enough frozen to give one bottle past 6 months (incorporating more formula by week 6).

LO is 4 weeks tomorrow