There are three main factors that contribute to healthy, strong bones. Genetics, physical activity, and proper calcium intake. With one eight ounce serving of milk providing 290 mg of milk, it is an excellent source of calcium. You can also offer a serving low-fat cheese which boasts 204 mg of calcium. Since milk is rich in calcium, which is essential for growth and proper strong bone structure milk helps prevent bone growth disorders and decrease the chance of bone fractures when injured.