Duration of a normal cycle

The duration of a normal cycle is 28 days with variations from 22-36 days. Cycle length, quality, duration of menses (period of Menstruation) show large fluctuations, the first two years of 55-90% are anovulatory cycles, and after 21 years of 60-80% are ovulatory cycles, i.e. fertile. In appearance of menarche contributes genetic and environmental factors.

The age of onset of menstruation (period) is usually identical to the mother and daughter. The most common external factors affecting menarche is the weight, amount of body fat, muscle exercise, or socioeconomic factors. Girl with moderate obesity occurs earlier menarche (Period - menstruation), while severe obesity menarche delayed. Breast (mammary gland) - In ⅔ of the girls breast enlargement is the first point of entry into puberty. It happens between 8-13 years, with an average price 11 years later. Sometimes breast enlargement in a girl is contra lateral followed later, six months, the swelling of the second breast. Pronounced asymmetry is rare.More link available beginner fitness program

May be due to previous injury in mammary gland or reduced sensitivity to estrogen. The development of breast estrogen effect is produced by the ovaries, but the size, shape defined by hereditary, or other trophic factors. The total time between second to fifth stages lasts about four years. For illustrative purposes - clinical use staging breast development in Turner, which appears in the stages below.
Stages of breast development at Tanner.Preteens:
Preteens: protrudes only the nipple                                                                          
·Small nipple swelling and breast, small diameter increase areola
.Biggest breast augmentation - areola relative to undistinguishable between the side view
·The nipple and areola forming a second wave sunken chest
·Mature stage: the swelling of the nipple and areola has subsided. The chest has a smooth contour breast adult woman.