Adolescence begins with the development of sexual traits affected by hormonal changes. It starts with breast development and menstruation in females.
Precocious breast development - Stock Image - C002/9615 - Science Photo Library
Mini-puberty of infancy in a 16-month-old girl with prominent breast
The Project Gutenberg eBook of Lippincott's Magazine, Volume 11, MARCH, 1873.
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How do girls' breasts develop during puberty?
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File:Adolescent Breast Development.jpg - Wikipedia
Effects Of Breast Development In Teens: Most Girls Quit Sports After Hitting Puberty, Study Finds