Tanner Scale of female breast development<unk> , also known as breast budding, is the onset of secondary breast development, which often represents the beginning of pubertal development. 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.<unk>  typically occurs between the ages of 8 and 13 years with significant variation between individuals. However, the initial growth of breast tissue occurs during fetal development regardless of sex. Usually, females experience menarche about 2 years after<unk>  has begun, with complete breast development from<unk>  to adult breasts, taking between 2 and 4 years. Moreover, puberty is considered delayed if breast development does not start before age 13 or if a female has not had her first period (menarche) within 3 years of<unk> . Additionally, secondary breast development occurring before the age of 7 or 8 years could be a sign of premature<unk>  or precocious puberty. Of note, for some girls<unk>  will occur, with subsequent regression of breast development, and then months or years later, normal breast growth will commence again accompanied by normal pubertal changes; this is termed transient<unk> . Pubertal changes, including breast development, are assessed using the Tanner Scale (Sexual Maturity Rating Scale) where stage 1 represents the lack of breast development, stage 2 is the breast budding or<unk>  stage, stages 3 and 4 are continual breast growth and areolar development, and stage 5 signifies completion of development. This system does not use breast size, but instead examines the shape of breasts, nipples, and areolae to determine the progression of growth. Various hormones interact and result in the changes seen during<unk> . The growth and accumulation of adipose tissue in the breasts are induced by estrogen, while the development of mammary glands and areolae are caused by progesterone; both estrogen and progesterone are produced by ovaries. Due to change in hormone levels, young breasts are likely to develop asymmetrically and in many cases, adult breasts will remain unequal in size or shape.
Thelarche
Pubarche
Menarche
Adrenarche
Gonadarche
Spermarche
Sunovion
Abulia