I have blonde peach-fuzz-like nose hair. Most women I have been around have thick, dark, visible hair, to the point they trim, or at least pluck the more visible ones out. It does not mean I don't have any, I do, it's just only visible under a flashlight. Strangely, I suffer from hirsutism, yet this is pretty much the only place where I do not grow hair (okay, and also my palms, and the soles of my feet). Kids grow hair slowly, and it's much finer than adult hair. I would not worry about it. At the same time, I don't see why you think there is a correlation between an internal, digestive disorder like acid reflux, which entails the stomach and esophagus and bodily hair...since when are those two things related?