My baby also was on soy formula since 4 months old due to some allergy problem. The allergy problem was gone since she was 7 months. But, she still on soy formula until now (she'll turn 1-year-old next week). I'm also thinking to change back to normal formula. I can't give you advice which formula is good because I'm living overseas. We have different brands here. But, the nurse in my country said that it doesn't matter to keep feeding my daughter the soy formula. "Milk" is no longer that important at this stage for my daughter. I should focus more on feeding her nutricious food. So, I'm still thinking whether I should change the formula for my daughter.