In certain conditions, some girls start way earlier or way later than that. But for girls with a normal growth and development curve, puberty will start during their middle school or high school years. During puberty, there is a natural increase in the hormone estrogen in the body. This is the hormone responsible for the dramatic changes that you are experiencing during adolescence, including your growing breasts. You may notice a lot more changes happening in your body, but breast development is usually the first thing you and everyone else would take note of. As your body develops, your breasts will normally be the first noticeable change during puberty.
This is a very common concern among female adolescents-even adult women! But it is quite common for each breast to be slightly different in size, a condition called asymmetry. Breast asymmetry is defined as a difference of form, position or volume of the breast, and it affects more than half of all women, so your daughter shouldn't feel alone. In fact, one study of women who wanted breast augmentation with implants found that 88 percent had natural asymmetries. Today, doctors can measure the symmetry of a woman's breasts via mammogram or, in your daughter's case, a special type of three-dimensional laser scanning called SCAN-3D, though these tests are not routinely available at most breast imaging centers. Any discussion of the size or shape of a woman's breasts requires some rudimentary understanding of the anatomy of the breast itself.
AT just seven years old, little Emily is going through the menopause. The youngster started to "become a woman" at the age of two when she started growing breasts. Two years later, at the age of four, Emily had her first period.
It is quite common for one breast to be bigger than the other as development occurs during puberty. Usually the breasts become the same size over time and do not need any treatment. However, if the breasts have not become more or less an equal size by the age of about 16 years old or near the end of puberty , they will probably remain unequal. About one in four adult women have some degree of asymmetry of the breasts.