Information about growth:
CDC Growth Charts
Boys: Growth Chart - 2 Years to 20 Years
Girls: Growth Chart - 2 Years to 20 Years
Kidshealth (Growth and Development)
The Magic Foundation

Information about Nutrition and Exercise:
Encouraging a Healthy Weight for Your Child
Eating and Exercising: What Works for You?
How to Read the Food Label
Body Image: Learn to Like What You See
Get Moving! Add Steps to Your Day
Physical Activity
Cholesterol: Tips for Kids and Teens
Calcium and Vitamin D for Health

Information about Endocrine Disorders:
The Pituitary Society
The American Thyroid Association
Turner's Syndrome Society
Hyperthyroidism
Hypothyroidism
Preventing Osteoporosis
The Hormone Foundation