Formula would be the last resort for babies. You can go for organic or soy milk before considering formula. In choosing formula I mostly check the Sugar content. I prefer low sugar to avoid hyperactivity and cavities in children. Also I always check the amount of DHA for brain development.
Most formula milk brands promise the same kinds of vitamin and nutrient content so I wouldn't scrutinise that portion so much. But I will probably go for an organic brand just because my friends have sang so many praises about organic ingredients and practices in making formula.
Dianne Espinosa Sese