Ages 11-15 are a time when fast-growing bones need calcium. Over 70% of boys and 90% of girls are not getting enough calcium. This lack of calcium will have a big negative impact on bones and teeth.
Start healthy eating habits for dairy products and calcium rich foods from the toddler years. The American Academy of Pediatrics recommended 16 oz of dairy products for kids < 9 years old and 24 oz for kids 9 years old and above.