13. Morquio Syndrome
This Massachusetts sixth-grader has Morquio Syndrome which is a rare inherited metabolic disorder that was diagnosed when she was 2. The progressive genetic disease can lead to abnormal bone development and dwarfism, which makes it hard to walk. Bella, just 42 inches tall, is not expected to grow much more, her mother Rachel, tells PEOPLE Magazine. The disease may not be visible at birth; symptoms usually begin between ages 1 and 3. Morquio syndrome is a progressive disease, meaning symptoms get worse as a child grows. However, Bella has felt nothing but better since George came into her life.