The population in the Netherlands is one of the tallest in Europe, maybe even in the world, and has become that way only recently (post WWII). One of the theories revolves around Dutch Agri-Business practices which use a lot of hormones and the like, ostensibly needed to produce super-high yields on very small acreages to feed to Dutch populations. I have not seen any scientific data - this is merely hearsay from a Dutch friend of mine.
Regarding Milk. I only drink/use Organic milk these days even though it costs about twice as much. Normally I do not go all ga ga over "organic" because there is no real evidence that non organic veggies and fruits are any better or worse for human consumption as long as you wash your fruits and veggies.
BUT, the organic milk comes from cows that are not given any antibiotics and more importantly any hormones to increase milk production. Those DO end up in the milk and can cause problems in humans. I don't really want or need any estrogen and it can increase the incidence of breast cancer in females. Just FYI.
Also...it is now believed that the increasing amounts of estrogen in milk is the #1 reason why young females are reaching puberty at such earlier ages than ever before.