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Primary Sex Characteristics
From the first day of our lives, as newborn babies, we have all the major sex organs and structures that we have as adults.
A baby has the same internal and external sex and reproductive organs that an adult does. These characteristics are called primary sex characteristics. We will have the primary sex characteristics with which we are born for the rest of our lives.
Secondary Sex Characteristics
As our bodies grow, our sex organs grow, too. As girls and boys grow, changes will happen to their bodies that make girls look more like women and boys look more like men. These changes happen during puberty and affect our secondary sex characteristics.
Puberty is a time when hormones stimulate change in all parts of the body. The changes affect what happens to the body on the inside—girls begin to menstruate, and boys begin to produce sperm and ejaculate. The changes affect our bodies on the outside as well. Girls develop breasts, and boys develop facial hair. Every person goes through puberty, but when and “how quickly” puberty and secondary sex characteristics develop are different for every person. Puberty generally lasts for a couple of years.
Puberty doesn’t happen at the same time for girls and boys. Very often, girls begin puberty between the ages of eight and 14. Boys usually begin puberty about two years later, between the ages of 10 and 15.
During puberty, young people of the same age may look very different. In a group of three friends, all age 13, the first may be almost done with puberty, the second may just be starting puberty, and the third may not yet have started. These three people have very different secondary sex characteristics, and they will all be normal. The time puberty begins does not indicate whether children will be bigger or smaller than anyone else when they are adults.
Puberty may be embarrassing for young women and men. The numerous changes our bodies go through may feel awkward. Erections or periods may happen at unwanted times. Breasts may make one feel self-conscious. Sweat may be produced in large amounts. Body odor becomes stronger than it was in childhood. Acne—pimples on the face caused by bacteria and trapped oil—may make one feel unattractive.
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