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  2. Leap week calendar - Wikipedia

    en.wikipedia.org/wiki/Leap_week_calendar

    A leap week calendar is a calendar system with a whole number of weeks in a year, and with every year starting on the same weekday. Most leap week calendars are proposed reforms to the civil calendar, in order to achieve a perennial calendar. Some, however, such as the ISO week date calendar, are simply conveniences for specific purposes. [1]

  3. Timeline of human prenatal development - Wikipedia

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

    Embryonic age: Week nr 1. 0 (whole) weeks old. 1–7 days from fertilization. Fertilization of the ovum to form a new human organism, the human zygote. (day 1 of fertilization [1]) The zygote undergoes mitotic cellular divisions, but does not increase in size. This mitosis is also known as cleavage. A hollow cavity forms marking the blastocyst ...

  4. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate, thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the ...

  5. Parental leave - Wikipedia

    en.wikipedia.org/wiki/Parental_leave

    A 10-week leave was associated with a 1–2% decrease; a 20-week leave with 2–4%; and 30 weeks with 7–9%. [77] The United States, which does not have a paid parental leave law, ranked 56th in the world in 2014 in terms of infant mortality rates, with 6.17 deaths per every 1,000 children born. [ 78 ]

  6. Sex assignment - Wikipedia

    en.wikipedia.org/wiki/Sex_assignment

    Sex assignment (also known as gender assignment [1] [2]) is the discernment of an infant's sex, typically made at birth based on an examination of the baby's external genitalia by a healthcare provider such as a midwife, nurse, or physician. [3] In the vast majority of cases (99.95%), sex is assigned unambiguously at birth.

  7. How many genders are there? Experts break it down - AOL

    www.aol.com/lifestyle/many-genders-experts-break...

    Thankfully, it’s 2021, and many of the terms surrounding gender are becoming more widely recognized in our society. “These concepts and terms will continue to evolve.

  8. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    Stillbirth is defined as fetal death after 20 or 28 weeks of pregnancy, depending on the source. It results in a baby born without signs of life. Each year about 21,000 babies are stillborn in the U.S. [159] Sadness, anxiety, and guilt may occur after a miscarriage or a

  9. Fetal viability - Wikipedia

    en.wikipedia.org/wiki/Fetal_viability

    The baby's gestational age (number of completed weeks of pregnancy) at the time of birth and the baby's weight (also a measure of growth) influence whether the baby will survive. Another major factor is gender: male infants have a slightly higher risk of dying than female infants, [41] for which various explanations have been proposed. [42]