I do believe that the hormones passed on to our kids via milk and meats have a lot to with children growing larger and developing earlier -- even in my lifetime (which has been pretty short, by relative standards) the huge change I've seen in development coincides a little too neatly with how many more additives are being pushed into our food chain....I don't think all of that can be explained by evolution alone... Of course, that's all purely anecdotal, and I've no official research to back it up!