Does "smaller" refer to height, weight, or both? I'm wondering how much of the size difference has to do with nutritional deficiencies vs. an overall awareness of our diets. Because we read every label, every time, we notice not only allergen-containing foods, but also artificial colors, flavors, and sweeteners. Our kids eat a lot less junk food than average American kids, and we eat out a lot less too (restaurant food tends to be higher in fat and sodium than home-cooked food). That...