The best formula out there is the formula your baby will eat and like.
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It's that simple. :)
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If your baby is flexible, then definitely...go for the powdered organic stuff in tins. But if not, then try things like Nestle GoodStart (which is supposedly sweet like breastmilk, from what I've been told).
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Dd came home at 9 months with a lot (!!!!!!) of issues that we thought might be related to switching formulas. It was only after months of stress, tears, and almost no sleep that we were able (through the help of a friend on this board) to have some of her original Korean formula shipped to the States. Shortly after that, many of her sleep issues went away. I can't say for sure it was the forumla, but needless to say we valued that stuff more than gold. Toward the end we started stretching out our supply by mixing it with GoodStart, and dd tolerated that.
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It's great to research the formulas and find out which one you think is best, but be prepared to throw all that out the window and stick with whatever formula your little one likes best. The last thing you want in a new relationship is to mess up the potential bonding time that bottlenursing can be. That was the reason we gave adoptive nursing, actually...in the end it became too much about me trying to push breastfeeding and her actively refusing it. Rather than have that kind of conflict in our early weeks, I just dropped it. For us, for our situation, it was the best thing I could have done. Bottlenursing was conflict-free, and tender, and all the bonding and more that breastfeeding could have been (because dd already knew and enjoyed bottle-feeding, and had had that secure/cuddly relationship with former caretakers).
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Oh...and the make-it-yourself formulas, I've heard, are not nearly as complete in their nutrition as the store-bought formulas. There are just too many micro-nutrients that do-it-yourself mixes miss.