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  2. Age and female fertility - Wikipedia

    en.wikipedia.org/wiki/Age_and_female_fertility

    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]

  3. Precocious puberty - Wikipedia

    en.wikipedia.org/wiki/Precocious_puberty

    African-American girls are especially prone to early puberty. [18] Though boys face fewer problems from early puberty than girls do, early puberty is not always positive for boys. Early sexual maturation in boys can be accompanied by increased aggressiveness due to the surge of pubertal hormones. [57]

  4. Birth spacing - Wikipedia

    en.wikipedia.org/wiki/Birth_spacing

    The global public health burden of short inter-pregnancy intervals is substantial. [2] In developing countries, children born two years or earlier after an older sibling were at a 60% increased risk of death in infancy, while those born between two and three years had a 10% increase, compared with those born after intervals of four to five ...

  5. Human fertilization - Wikipedia

    en.wikipedia.org/wiki/Human_fertilization

    There is also considerable variability in this interval, with a 95% prediction interval of the ovulation of 9 to 20 days after menstruation even for an average woman who has a mean LMP-to-ovulation time of 14.6. [32] In a reference group representing all women, the 95% prediction interval of the LMP-to-ovulation is 8.2 to 20.5 days. [31]

  6. List of multiple births - Wikipedia

    en.wikipedia.org/wiki/List_of_multiple_births

    They were five boys and four girls; two of the boys were stillborn, [145] and the last of the surviving babies, a boy named Richard, died six days after the birth. [146] [147] Mrs Brodrick had two older daughters, Belinda and Jacqueline, both single births. [148] A set of nonuplets was born on 26 March 1999, in Malaysia to Zurina Mat Saad. She ...

  7. Timeline of human prenatal development - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_human_prenatal...

    The fetus weighs about 2.5 to 3 kg (6 lb 10 oz)to 6 lb 12 oz). Lanugo begins to disappear. Body fat increases. Fingernails reach the end of the fingertips. A baby born at 36 weeks has a high chance of survival, but may require medical interventions. Fetus at 38 weeks after fertilization. [12]

  8. Category:Precocious puberty and pregnancy - Wikipedia

    en.wikipedia.org/wiki/Category:Precocious...

    Pages in category "Precocious puberty and pregnancy" The following 5 pages are in this category, out of 5 total. ... 0–9. 2009 Brazilian girl abortion case; 2022 ...

  9. Menarche - Wikipedia

    en.wikipedia.org/wiki/Menarche

    Fewer than 10% of U.S. girls start to menstruate before 11 years of age, and 90% of all U.S. girls are menstruating by 13.8 years of age, with a median age of 12.4 years. This age at menarche is not much different (0.3 years earlier) than that reported for U.S. girls in 1973.

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