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.
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Normal Breast Development
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. Or maybe you felt an ache when you've rolled onto your stomach in bed. Sometimes it may have felt like your breasts gained weight overnight. If you're a guy, you may have noticed some tenderness and even a lump beneath your nipple area. Whether it's a dull ache or a sharp pain, soreness in your breasts might make you worry about breast cancer. But try to stay calm. Breast pain in a teen is rarely cancer.
Jump to navigation. Breast development is caused by hormones released by the ovaries at puberty. These hormones cause fat to accumulate, causing your breasts to enlarge. The first sign of breast development is slight swelling under the nipple, a stage of development called breast buds. As your breasts first start to grow, they can be very tender and sore. They may also itch as your skin gets stretched.
What age do breasts fully develop? How do breast start to develop? Are my breasts normal? Can I change the way my breasts develop? Further support. The rate at which breasts grow is different for everyone. When breasts start to develop, a small bump called a breast bud grows under the nipple and areola the darker area of skin around the nipple.