Sexual maturity rating (Tanner staging) of breast development in females

Stages in breast development in females.
Stage 1 – Prepubertal, with no palpable breast tissue.
Stage 2 – Development of a breast bud, with elevation of the papilla and enlargement of the areolar diameter.
Stage 3 – Enlargement of the breast, without separation of areolar contour from the breast.
Stage 4 – The areola and papilla project above the breast, forming a secondary mound.
Stage 5 – Recession of the areola to match the contour of the breast; the papilla projects beyond the contour of the areola and breast.