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start shaving is entirely up to you. On average, a boy starts shaving sometime between eleven and seventeen years.
    If you have curly hair, it might be a good idea to have someone, perhaps a relative or a barber, teach you the best way for you to shave without irritating your face. There are shaving gels made especially for various skin types and ethnicities.
    Breasts
    As your testosterone levels adjust and settle down, you might develop gynecomastia. 1 This temporary condition causes your breasts to enlarge and become tender or sore. Your nipples can also enlarge and darken, and you may develop a flat bump that looks like a button under one or both of them. Don’t worry! Gynecomastia occurs in more than half of teenage boys as they go through puberty. It is more common in boys who are overweight or who use a lot of marijuana. Consult your familydoctor if the breast tissue is very firm, painful, has any liquid coming from the nipple, or lasts longer than a few months.
    All these changes don’t always happen in exactly the same way, at the same time, for everyone. Depending on what the hormones in your body decide, you may start puberty by developing pubic hair, or underarm hair, or both at the same time.
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    1    gynecomastia (guy-nuh-co- mast -ia)

8.
    Changes in Girls’ Bodies That You Can See
    Weight Gain
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    During puberty it is normal not only to grow taller but also to gain weight. This stage lasts about three years, and a girl may gain between thirty-five and fifty-five pounds during this time. Instead of dieting, eat healthily (see this page in Chapter 19 ) and stay physically active.
    Breasts
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    Each breast has a raised nipple, surrounded by a circle of skin of the same color called the areola. 1 The breasts themselves are made of fat tissue, milk glands, and ducts. After a woman has a baby, the glands will produce milk, which then travels through the ducts to the nipples, each of which has several tiny openings through which the baby can suck the milk.

    Sometimes when a nipple is squeezed, a discharge comes out that may look white, clear, or pale yellow-green. Or you may see a little crust around a nipple where fluid came out and dried. Now and then the body makes this fluid to wash out the breast ducts. This is normal.
    The nipples and areolae vary in color from light pink to dark brown. Some are quite small and others can be very large, covering almost the entire end of the breast. Nipples are very sensitive and may respond to cold, touch, or sexual feelings by becoming erect. The nipples stiffen and stand up, and the areolae may tighten up and look bumpy. After a while, the nipples return to normal.
    Breast Development
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    Doctors divide breast growth into five stages.
• Stage 1: Childhood. During childhood, breasts are flat. The nipple sticks out from a small areola.
• Stage 2: Breast Buds. When puberty begins, breast buds develop. These are raised bumps that start to grow under the nipples. This is normal. Both the nipples and the areolae grow larger and darker. It’s normal sometimes to feel a little tenderness or itchiness in your breasts. This stage can last from several months to over a year.
• Stage 3: Development. As the nipples and areolae keep growing and getting darker, breasts, too, grow larger and may look a little pointed. This stage also can last from a few months to a few years.
• Stage 4: Mound. You may see the nipple and areola blending into a separate mound that sticks out from the breast. It may not happen, or it may happen in the next stage.
• Stage 5: Adulthood. Breasts develop completely, usually with a full, round shape. The areola blends into each breast and may develop a few hairs around its edges. Usually the nipple rises above it, but some women instead have inverted nipples—nipples that go inward.



If inverted nipples develop during puberty, they are normal, and when you have a baby you can breast-feed normally,so learn how to clean them. You can ask a