From the USDA and its Choose My Plate program concerning milk and young children:
Milk and milk products provide many vital nutrients that your
preschooler needs for growth. Milk is a good choice to offer as a
beverage at meals and snacks.
While some children don't drink
enough milk, others sometimes prefer to fill up on milk and avoid other
important foods. Preschoolers need about 2 to 2 ½ cups from the dairy group each day. Help your child get enough but not too much milk.
fat-free or low-fat milk. These have the same amounts of calcium,
protein, and vitamin D as whole or 2% milk, but less saturated fat and
All types of fluid milk are typically fortified with
vitamin D. Some yogurts are also fortified with vitamin D. Vitamin-D
fortified products help build and maintain bones.
Make sure you serve only pasteurized milk (not raw milk) to preschoolers.