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In the United States, the age of onset of puberty in girls depends heavily on their racial background. Delayed puberty means the lack of breast development by age 12.8 years for White girls, and by age 12.4 years for Black girls. [7] [8] The lack of menstruation by age 15 in any ethnic background is considered delayed. [8]
Amenorrhea or amenorrhoea is the absence of a menstrual period in a female who has reached reproductive age. [1] Physiological states of amenorrhoea are seen, most commonly, during pregnancy and lactation (breastfeeding). [1] Outside the reproductive years, there is absence of menses during childhood and after menopause. [1]
The first period, a point in time known as menarche, usually begins between the ages of 12 and 15. [1] Menstruation starting as young as 8 years would still be considered normal. [2] The average age of the first period is generally later in the developing world, and earlier in the developed world. [3]
Most people with uteruses start menstruating anywhere between 8 and 16 years old, ... reason for a missed period, ... first period, it can take from six months to a year for your period to become ...
1. Pregnancy. Cramping can actually be caused by the opposite of getting your period—it may be a sign of early pregnancy, says Julia Cron, M.D., site chief and vice chair of the Department of ...
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
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Middle childhood/preadolescence or ages 6–12 universally mark a distinctive period between major developmental transition points. [2] Adolescence is the stage of life that typically starts around the major onset of puberty, with markers such as menarche and spermarche, typically occurring at 12–14 years of age. [3]