![]() Once ovulation and menstruation begin, the maturing of the breasts begins with the formation of secretory glands at the end of the milk ducts. Often these breast changes happen at the same that pubic hair and armpit hair appear. When the ovaries start to produce and release (secrete) estrogen, fat in the connective tissue starts to collect. This often starts around age 35.Īs a girl approaches her teen years, the first visible signs of breast development begin. Shrinkage (involution) of the milk ducts is the final major change that happens in the breast tissue. The mammary glands slowly start to shrink. Mammary glands are influenced by hormones activated in puberty. ![]() Mammary glands develop next and consist of 15 to 24 lobes. The first thing to develop are lobes, or small subdivisions of breast tissue. By the time a baby girl is born, nipples and the beginnings of the milk-duct system have formed.īreast changes continue to happen over a woman’s life. This starts with a thickening in the chest area called the mammary ridge or milk line. When does breast development begin?īreasts begin to form while the unborn baby is still growing in the mother’s uterus. Changes also happen to the breasts during the menstrual cycle and when a woman reaches menopause. ![]() Breast development happens in certain stages during a woman's life: first before birth, again at puberty, and later during the childbearing years. Breast development is a vital part of a woman’s reproduction. ![]()
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