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Breast development, also known as mammogenesis, is a complex biological process in primates that takes place throughout a female's life. It occurs across several phases, including prenatal development , puberty , and pregnancy .
For pubescent girls in thelarche (the breast-development stage), the female sex hormones (principally estrogens) in conjunction with growth hormone promote the sprouting, growth, and development of the breasts. During this time, the mammary glands grow in size and volume and begin resting on the chest. These development stages of secondary sex ...
The Tanner scale (also known as the Tanner stages or sexual maturity rating (SMR)) is a scale of physical development as pre-pubescent children transition into adolescence, and then adulthood. The scale defines physical measurements of development based on external primary and secondary sex characteristics , such as the size of the breasts ...
Thelarche, also known as breast budding, is the onset of secondary breast development, often representing the beginning of pubertal development. [1] It is the stage at which male and female breasts differentiate due to variance in hormone levels; however, some males have a condition in which they develop breasts, termed gynecomastia .
Hoffmeester recorded 15 second videos every week of his daughter, Lotte, from a newborn to a teenager and compiled them together to make a time-lapse video. He calls it "the ultimate coming of age time-lapse". He has done several videos of her being recorded to different ages, such as 12, 14, 16, 18 and 20 years old. [8] [9]
The mammary ridge is primordial for the mammary glands on the chest in humans, and is associated with mammary gland and breast development.. In human embryogenesis, the mammary ridge usually appears as a narrow, microscopic ectodermal thickening during the first seven weeks of pregnancy and grows caudally as a narrow, linear ridge. [1]
Self-perceived micromastia involves a discrepancy between a person's body image, and their internalized images of appropriate or desirable breast size and shape. Societal ideals over breast size vary over time, but there exist many conceived ideas involving breasts and sexual attractiveness and identity across different cultures.
Puberty is considered delayed when the child has not begun puberty when two standard deviations or about 95% of children from similar backgrounds have. [7] [8] [9]In North American girls, puberty is considered delayed when breast development has not begun by age 13, when they have not started menstruating by age 15, [2] and when there is no increased growth rate. [8]