For what it's worth, my sister in law is a pediatric nurse. She and one of her colleagues researched all the store brand formulas and found that Target brand was the closest to Enfamil/Similac and it's what she feeds her nephew.
My pediatrician told me that the store brand is just as good as the name brand. The percentages might be a little off, but it's not enough to make a difference. I fed my first baby store brand from 8-12 months. Woudl have done it sooner but they didn't have a store brand Gentlease like they do now. DS2 is breastfed but if he ever goes to formula we will be using Target brand.
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