page_title: Tanner scale
section_title: Breasts (female)
hierarchical_section_title: Tanner scale / Definitions of stages / Breasts (female)
caption_attribution_description: Français&#160;: Cinq étapes de la Classification de Tanner - développement des seins English: Five Tanner stages - Breast growth
context_page_description: The Tanner scale is a scale of physical development in children, adolescents and adults. The scale defines physical measurements of development based on external primary and secondary sex characteristics, such as the size of the breasts, genitals, testicular volume and development of pubic hair. This scale was first identified in 1969 by James Tanner, a British pediatrician, after a two-decade-long study following the physical changes in girls undergoing puberty.
  Due to natural variation, individuals pass through the Tanner stages at different rates, depending in particular on the timing of puberty. In HIV treatment, the Tanner scale is used to determine which regimen to follow for pediatric or adolescent patients on antiretroviral therapy. The Tanner scale has also been used in forensics to determine aging, but its usage has decreased due to lack of reliability.
context_section_description: Tanner  I
  no glandular tissue: areola follows the skin contours of the chest (prepubertal) (typically age 10 and younger)
  Tanner II
  breast bud forms, with small area of surrounding glandular tissue; areola begins to widen (10–11.5)
  Tanner III
  breast begins to become more elevated, and extends beyond the borders of the areola, which continues to widen but remains in contour with surrounding breast (11.5–13)
  Tanner IV
  increased breast sizing and elevation; areola and papilla form a secondary mound projecting from the contour of the surrounding breast (13–15)
  Tanner V
  breast reaches final adult size; areola returns to contour of the surrounding breast, with a projecting central papilla. (15+)
caption: Photos of the Tanner scale for females.
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