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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]
Fertility in colloquial terms refers the ability to have offspring. In demographic contexts, fertility refers to the actual production of offspring, rather than the physical capability to reproduce, which is termed fecundity. [1] [2] [3] The fertility rate is the average number of children born during an individual's lifetime.
Female infertility varies widely by geographic location around the world. In 2010, there was an estimated 48.5 million infertile couples worldwide, and from 1990 to 2010 there was little change in levels of infertility in most of the world. [ 2 ]
One definition of infertility that is frequently used in the United States by reproductive endocrinologists, doctors who specialize in infertility, to consider a couple eligible for treatment is: a woman under 35 has not conceived after 12 months of contraceptive-free intercourse.
Ovulation is an important part of the menstrual cycle in female vertebrates where the egg cells are released from the ovaries as part of the ovarian cycle. In female humans ovulation typically occurs near the midpoint in the menstrual cycle and after the follicular phase. Ovulation is stimulated by an increase in luteinizing hormone (LH).
[71] [70] [72] It is distinct from the definition of the biological female sex, [73] [74] as both men and women can exhibit feminine traits. Most women are cisgender, meaning their female sex assignment at birth corresponds with their female gender identity. Some women are transgender, meaning they were assigned male at birth. [6]
Donald Trump claimed he has a “very fertile brain” as he defended his rambling speeches during a rally in Milwaukee, Wisconsin, on Friday, 1 November. The former president described how he ...
Fecundity is defined in two ways; in human demography, it is the potential for reproduction of a recorded population as opposed to a sole organism, while in population biology, it is considered similar to fertility, [1] [2] [3] the natural capability to produce offspring, [4] measured by the number of gametes (eggs), seed set, or asexual ...