BabyCenter suggests that 12-month-old children drink 16 to 20 ounces of whole milk per day to reach their daily nutritional requirements of vitamin D and calcium. Children should not drink more than 24 ounces of whole milk because they require other sources of nutrition.
BabyCenter explains that cow's milk is an important part of a child's diet once his digestive system is ready for it. The calcium in milk helps to regulate muscle control and blood clotting. Calcium also builds strong bones and teeth. Vitamin D is essential because it helps the body absorb calcium and is a significant factor in bone growth.