While healthy weights for adults are set by body mass index -- BMI -- charts, healthy weight ranges are difficult to determine for children and teens. It is hard to state a "normal" weight for a 15-year-old, and more important to advise a healthy BMI-for-age range.

Reaching and maintaining a healthy weight is critical for overweight and obese teenage girls. The Centers for Disease Control and Prevention reports that about 21 percent of U.S.

Teenage pregnancy is a serious social problem. According to the March of Dimes, about three in 10 teenage girls become pregnant before the age of 20. While many of these pregnancies end in abortion or adoption, teen girls who do decide to keep their babies face many challenges.