This is very important question that some people are accept that Milk is Nonvegetarion because of milk is comming from animal body.
But true thing is Milk is vegetarion because of milk is come from animal body but we don't have to kill animal for getting milk and we have to provide good food to animal and we also know that mother is also provide milk to children without any trouble and getting happy during provide milk to children.
Milk is very important product for vegetarion people because of all vitamins are available in Milk.