Hi,
There are lots of moms who feed their babies soy. However, I've heard and read articles that say soy is not that good for you. But who knows what true, I am sure I could find articles saying soy was good too. I think Nestle Good Start is a good one. I would check with your pediatrician on which formula to start with. That is my rule of thumb, always ask the doctor as well as other moms.
Babies often have a hard time digesting regular formula, one of my boys did. Babies stomach's are not fully developed when they are born so they don't always digest regular formula well. Breastfeeding is much easier on their stomachs. Even then, sometimes "mom" has to be on a special diet because what she eats and drinks can bother them. I had to be on a special diet because my son was allergic to milk, soy and beef. But as a bonus I lost a ton of weight!
They make formula that is not soy but it not milk based either so babies that are allergic or have digestive problems can still use it. They make two, Alimentum and Nutramigen. It is very expensive. When I was done breastfeeding I put my son on it, it was $25 a can versus the usual $10. But obviously it was worth it to have a happy, healthy baby.
I hoped this helped some. Best of luck.
I've known moms that used soy however if your baby is not allergic to milk and does not have any special requirements that forces him to be on an alternative, I wouldn't. There are several good formulas I would use before soy. Again I would ask your pediatrician.