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  2. 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 ...

  3. Human reproduction - Wikipedia

    en.wikipedia.org/wiki/Human_reproduction

    Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. [16] For optimal pregnancy chance, there are recommendations of sexual intercourse every 1 or 2 days, [ 17 ] or every 2 or 3 days. [ 18 ]

  4. Fetal viability - Wikipedia

    en.wikipedia.org/wiki/Fetal_viability

    Whether the fetus is in the period of viability may have legal ramifications as far as the fetus' rights of protection are concerned. [23] Traditionally, the period of viability referred to the period after the twenty-eighth week. [24] Indian Law considers the period of viability to be the period after 28 weeks of gestational age. [25]

  5. Estimated date of delivery - Wikipedia

    en.wikipedia.org/wiki/Estimated_date_of_delivery

    [13] [14] The result is approximately 280 days (40 weeks) from the start of the last menstrual period. Another method is by adding 9 months and 7 days to the first day of the last menstrual period. Naegele's rule is named after Franz Karl Naegele, the German obstetrician who devised the rule. Naegele was born July 12, 1778, in Düsseldorf, Germany.

  6. Prenatal development - Wikipedia

    en.wikipedia.org/wiki/Prenatal_development

    The perinatal period (from Greek peri, "about, around" and Latin nasci "to be born") is "around the time of birth". In developed countries and at facilities where expert neonatal care is available, it is considered from 22 completed weeks (usually about 154 days) of gestation (the time when birth weight is normally 500 g) to 7 completed days ...

  7. Postterm pregnancy - Wikipedia

    en.wikipedia.org/wiki/Postterm_pregnancy

    Postterm pregnancy is when a woman has not yet delivered her baby after 42 weeks of gestation, two weeks beyond the typical 40-week duration of pregnancy. [1] Postmature births carry risks for both the mother and the baby, including fetal malnutrition, meconium aspiration syndrome , and stillbirths . [ 2 ]

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