A new study suggests that boys in the United States, like girls, are entering puberty slightly earlier than previously thought, with blacks the most likely to develop the first signs by age 10.

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September 14, 2001

By James S. Winshall, M.D.
Harvard Medical School

How does this article relate to you?

This study adds yet more evidence to the notion that American children are entering puberty at earlier ages. Compared to a century ago, the average age of puberty seems to have moved up by as much as several years.

The reasons for this shift remain poorly understood. There are clearly changes in the clock that controls the release of sexual hormones. However, no one is sure whether this clock is being affected by diet, environmental chemicals, stress, genetics or some combination of all of these factors.

What changes do you need to make?

Probably none, other than being sensitive to differences in your child's appearance and behavior. Remember to talk to your child about what he or she can expect from puberty, preferably before it starts. Be sure to discuss important topics such as menstruation, sexuality and pregnancy.

If you are a parent, don't make assumptions about when your child will go through puberty. As this study showed, some boys and girls may start to experience hormonal changes as early as age eight. Others may be delayed until their mid-teens. Keep in mind that puberty means many changes for your child: a growth spurt; moodiness or social problems; and the development of adult sexual organs and desires.

What can you expect in the future?

Researchers are likely to continue collecting data on these trends. And more importantly, we should begin to find answers about why the age of puberty seems to be getting younger and younger.

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