Your Budding Daughter: Some Practical Suggestions for Parents

Written by Jennifer Johnson, MD, MS

What? Already?
Puberty in Girls, Step By Step
The Stages of Development
'Is This Normal?' When to See Your Physician
Helping Your Daughter to Be Well-Informed
Sex Education
Menstruation, tampons and pads
Bras
In Closing

What? Already?

Puberty! It started happening to my 10-year-old daughter this spring. She needed new sandals - women's size 7 sandals! She got those little bumps under her nipples that we doctors call 'breast buds'. Next, I was 'excused' from joining her in the dressing room when we shopped for her clothes, and the bathroom door was locked when she showered. The pants I hemmed up in June were too short by October, despite only being washed once. And she admits to

As a loving mom and adolescent medicine specialist, these are heady times for me. I am proud of my daughter and thrilled to see her embark on this road toward womanhood. I know that she is progressing normally. But still I think, 'Hold on, she's only in fifth grade!'

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.

The height spurt

Ultimately, 20-25% of a girl's adult height is acquired in puberty. The height spurt usually begins just before or after breast budding develops. Over a period of about 4 years, girls grow close to a foot taller than they were at the beginning of the height spurt. The bones that grow first are those furthest from the center of the body. This is why my daughter's shoe size shot up before the rest of her body began growing faster. The earlier growth in the arms and legs accounts for the awkwardness and 'gangly' appearance of many teenagers. Their center of gravity is shifting, and they haven't gotten used to those long arms and legs. The growth in the spinal column alone accounts for 20% of the height increase. This is why it is important to check for scoliosis (sideways curvature of the back) before puberty begins. A slight curve can turn into a much larger one during all that growth.

The weight spurt

A girl's height spurt is followed about 6 months later by her weight spurt. This is, of course, when she can never get enough to eat. Fully 50% of ideal adult body weight is gained in puberty. In girls, the proportion of body weight in fat increases from about 16% to nearly 27%. Lean body mass, especially muscle and bones, also increase substantially. It's the growth and maturation of bones, in particular, which makes calcium intake so important.

Getting enough calcium

Most of you know of the importance of good calcium intake for all women, especially growing teenagers, pregnant women, and nursing mothers. Milk and other dairy products are the least expensive, most convenient sources. Nonfat milk has just as much calcium as whole milk. If your daughter doesn't like milk, try doctoring it up with chocolate powder or syrup (this is the only way I can get my daughter to drink it). Calcium is also available as a nutritional supplement in tablet form, but many teenagers find the tablets too large to swallow comfortably. Your daughter may like the fruit or chocolate-flavored calcium-supplement chews available in drugstores now.