My daughter is perfectly normal. Puberty, often first recognized at the onset of breast development, usually begins about the time a girl turns 10. There is a wide range of ‘normal’ starting times, and the onset time varies in different ethnic groups. For instance, it may occur between the ages of 8 and 14 in white girls, and may begin as early as 7 years of age in African American girls.
Puberty in Girls, Step by Step
Puberty is outwardly manifested by two main sets of changes:
- Rapid increases in height and weight, referred to as the Height and weight spurts
- Development of breasts, and pubic and axillary (underarm) hair
Tracking the changes during puberty
These changes, and the other physical changes of puberty, occur in a predictable sequence. We use sexual maturity rating (SMR) scales to track a youngster’s progression through puberty. Knowing the timing of these changes, related to each other and related to the sexual maturity ratings, is very helpful. After all, most of us like to know what to expect. For example, when my daughter developed breast buds, I was able to tell her that she’d start finding little hairs near her labia majora (outer lips of the vagina) within six months or so. And she knows that she is likely to have her first menstrual period about 2 years after her breasts first started developing. This means she’ll be a little over 12 years of age, close to the national average of 12 years and 4 months.
