My nearly 6 year old dd has a bit of a raise nipples and chest. My 9 year old dd is completely flat so I am getting a bit concerned this is not normal. They are both slim. She does drink a lot of soya yogurts and I am wondering whether this could be the cause. I don't give her cow yogurts as she suffers from reflux. She also drinks almond milk. She does not complain of them being painful or anything.