I totally agree with you it is so unhealthy. I have a 3 year old son and he doesn't drink as much milk as that child does, also my son weighs approx 36lbs, and this boy is only 2 years old and weighs twice as much as my son.
I am starting to get fed up with it, I cannot provide so much milk to that child. He doesn't want to eat, is parents say give him milk he will be fine