HONG KONG -- Li Tai's son was just 5 years old, but the father worried the boy was falling behind.

Lu Wenli examines a 10-year-old boy at Shanghai Ruijin Hospital: The doctor's department treats 400 to 500 children a week for height-related issues at peak periods. (Photo by Wen Xia)
Heightened competition for spouses and jobs spurs pursuit of growth hormones