Menarche (/məˈnɑːrki/ mə-NAR-kee; from Ancient Greek μήν (mēn) 'month', and ἀρχή (arkhē) 'beginning') is the first menstrual cycle, or first menstrual...

complete puberty at ages 16–17. The major landmark of puberty for females is menarche, the onset of menstruation, which occurs on average around age 12½. For...

normally last between 21 and 35 days, with a median length of 28 days. Menarche (the onset of the first period) usually occurs around the age of 12 years;...

sexual characteristics by age 13 with no menarche or normal secondary sexual characteristics but no menarche by 15 years of age. It may be caused by developmental...

body hair growth, breast development and menarche (the onset of menstruation). Most girls go through menarche between ages 12–13, and are then capable...

breast tissue occurs during fetal development. Usually, females experience menarche about two years after thelarche has begun, with complete breast development...

compromised 16- to 20-year-old virgins after menarche. The highest rank comprised 14-year-old virgins before menarche. ("The Role of Sexual Lore in Taoism" begins...

pubertal timing may be influenced by weight, physical activity, and genetics. Menarche, a central event of female puberty, is associated with the father's absence...

spontaneous menarche, while 88% with 45,X0/47,XXX (the presence of a trisomy X cell line) experienced spontaneous thelarche and 66% spontaneous menarche. Unexpectedly...

pregnancy has not occurred. The first period, a point in time known as menarche, usually begins between the ages of 12 and 15. Menstruation starting as...