This stage of your life is when you change from a girl into a young woman. Puberty will last a few years. During puberty, your body will go through some amazing changes. And your feelings may take you on a roller coaster ride.

Each part of your body has its own job to do. You have special parts that are protected on the inside of your body. When the time comes, they help create and support a growing baby. Some of your special parts are on the outside. They are called genitals or private parts. You can see them with the help of a mirror.

A period is the result of a cycle that takes place inside a girl’s body. This menstrual cycle makes it possible for women to have babies. The cycle begins with ovulation, when an egg is released and begins its journey.

When you first get your period, it’s normal to be confused and wonder what’s happening to you. If all your questions aren’t answered here, talk to your mom or someone else you trust.

A young girl's first period should not happen out of nowhere; it should never be a complete surprise.

Breasts change over time. Their size and texture may vary with shifts in your body weight. Breasts also change as you go through different stages of your life.

A woman’s menstrual cycle (monthly period) is controlled by changing levels of certain hormones. These hormones travel through the blood. Two hormones, estrogen and progesterone, play a big role in the menstrual cycle.