Milk really doesn’t do much for children, especially the supposed link to “bone health”. If kids are not properly fed at home, the same argument can be made that we should be making sure they at least get actual water to drink at school. Alternatively, there are plant milk options that can actually be healthier or more vitamin-rich than cow’s milk.

https://med.stanford.edu/news/all-news/2018/08/christopher-gardner-busts-myths-about-milk.html

https://www.hsph.harvard.edu/nutritionsource/milk/