They turn into a blood-like fluid and flow out of your vagina. If the egg doesn’t connect with a sperm, the body does not need this tissue or these cells. To help your body prepare for this, a thick layer of tissue and blood cells builds up in your uterus. If an egg connects with sperm from a man’s penis (fertilization), it will grow inside your uterus and develop into a baby. A girl who has started having periods is able to get pregnant, even if she doesn’t have a period every month.ĭuring puberty, your ovaries begin to release eggs. It can take up to 2 years for periods to occur every month. Most girls get their periods 2 to 2 1/2 years after their breasts start to grow (between 10 and 15 years old). Your menstrual cycle, or “period,” starts during puberty. This is normal and gives your body a curvier shape. As you go through puberty, you’ll get taller, your hips will get wider, and your body begins to build up fat in your belly, hips, thighs, buttocks, and legs. Talk with your mom or another trusted adult about your feelings and get advice on tank tops and bras.Ĭurves. Other girls may feel embarrassed, especially if they are the first of their friends to have breasts. When your breasts get larger, you may want to start wearing a tank top or bra under clothing. By the time your breasts are fully developed, they usually end up being the same size. Don’t worry if one breast grows a little faster than the other.
There may be soreness, which will go away as your breasts grow. The first sign of puberty in most girls is breast development (small, tender lumps under one or both nipples).