E.C.
Most store brands are a generic for Enfamil brand formula. That could be why she started spitting up again. Give it some time. You can also try mixing the two and gradually switch her to the generic.
It is a huge savings!! I estimated we saved close to $50 a month! I wish I would have known with my first :) (they also sell generic at Sam's which is even a little bit more savings, plus the cans are almost twice the size, that means fewer store runs!!)