Breast Development - Girl breast grow
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Breast development, or the growth of a girl’s breasts, is often the first sign of puberty for females. Breast development is caused by hormones released by the ovaries at puberty. The first sign of breast development is slight swelling under the nipple, a stage of development. Girls usually begin puberty between the ages of 8 and 13 years old. Uneven breast growth and soreness are both totally normal and usually.