Here's an overview of the major physical changes girls can expect as they go through puberty:. Girls usually begin puberty between the ages of 8 and 13 years old. The earliest sign of puberty in most girls is the development of breast "buds," nickel-sized bumps under the nipple. It is not unusual for breast growth to start on one side before the other. It's also common for breast buds to be somewhat tender or sore. Uneven breast growth and soreness are both totally normal and usually improve with time. Coarser hair will begin to grow in the genital area, under the arms, and on the legs. Around the time they reach middle school, many girls begin to show interest in shaving their legs and armpits. This is a personal choice; there is no medical reason to shave armpit or leg hair. Before giving them a razor, show them how to use it properly and avoid skin irritation and cuts, which can become infected.
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There is no perfect shape or size for breasts. Normal breasts can be large or small, smooth or lumpy, and light or dark. Your breasts start growing when you begin puberty. During puberty the hormone levels in your body change, which causes your breasts to develop and your periods to start. The inside of your breasts is made up of fatty tissue and milk-producing glands, called mammary glands.
Normal Breast Development
It is normal for girls and teenagers to have lots of questions about their breasts as they start to develop. Seeing the body change can be daunting, and it is perfectly normal to worry about what to expect. Here are some common questions and answers about breast development to help guide teenagers through the process. Breasts develop as the hormones estrogen and progesterone are released at puberty. These hormones make the breast tissue grow. As it does, the surrounding skin may stretch, which is one reason breasts can hurt when they grow. The hormones that stimulate breast growth are another reason they may hurt. Hormones change the levels of fluid in the breast tissue, which can make the breasts more sensitive and even hurt. If a young woman has started her period, her breasts may also hurt around her menstrual cycle. These aches are due to hormonal changes and are a normal part of the menstrual cycle.
Like most parts of the body, breasts can be sore from time to time. Not only for girls, but for guys too. You may be worried about your body's development, about what causes breast soreness, and even about cancer. If you're a girl, you may have noticed a slightly sore feeling when you wash your breasts in the shower.