Hi, I have 3 kiddos. I breastfed all for 6 months then moved to Enfamil Lipil. When they were 1 yr of age and ready to transition to regular milk, they all had a reaction to it (funny because i breastfed and used a milk based formula). They had a high sensitivity to it. So all went on soy milk, and the first 2 were on it for about a year to a year and a half, my 17 month is on it now. My question for you is why do you want to switch to soy if theres no milk senstivity issue? Is it a vegan matter and don't want to use animal milk? If not, they do have organic cows milk, which I use for my 2 older kids (6 & 3). But if you don't want to give her cow's milk, Soy milk is good, it does contain high levels of estrogen. I don't think you would have to swith the formula, like I said, my kids were on the Enfamil and went to the soy milk. My peds said that whole milk is best because babys brain still needs the fat from it for development. Organic is a personal choice, it doesn't have any of the extra hormones or antibiotics in it that they give non organic cows, however I do give non organic too, organic is double the price. As for vitamins, I give my older one chewables, and for the baby I give her polyvisol liquid drops. I do have good eaters, but I can't always make sure they are getting the right amounts from food. I personally would stick to what you are doing, and then use whole organic milk, if she doesn't have any problems w/ milk base products. I hope this helps, and of corse bring it up w/ your doctor. Good Luck! T.