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  2. Estimated date of delivery - Wikipedia

    en.wikipedia.org/wiki/Estimated_date_of_delivery

    The estimated date of delivery ( EDD ), also known as expected date of confinement, [1] and estimated due date or simply due date, is a term describing the estimated delivery date for a pregnant woman. [2] Normal pregnancies last between 38 and 42 weeks. [3] Children are delivered on their expected due date about 4% of the time.

  3. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    Gestational age. In obstetrics, gestational age is a measure of the age of a pregnancy taken from the beginning of the woman's last menstrual period (LMP), [1] or the corresponding age of the gestation as estimated by a more accurate method, if available. Such methods include adding 14 days to a known duration since fertilization (as is ...

  4. Crown-rump length - Wikipedia

    en.wikipedia.org/wiki/Crown-rump_length

    An ultrasound showing an embryo measured to have a crown-rump length of 1.67 cm and estimated to have a gestational age of 8 weeks and 1 day. Crown-rump length ( CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump). It is typically determined from ultrasound ...

  5. East Asian age reckoning - Wikipedia

    en.wikipedia.org/wiki/East_Asian_age_reckoning

    Because the first year comes at birth and the second on the first day of the New Year, children born, for example, on December 31 are considered to become two-year-olds the very next day, New Year's Day (of the Gregorian, not the Korean calendar). There are few online calculators which can conveniently determine Korean age for any date.

  6. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    Naegele's rule is a standard way of calculating the due date for a pregnancy when assuming a gestational age of 280 days at childbirth. The rule estimates the expected date of delivery (EDD) by adding a year, subtracting three months, and adding seven days to the origin of gestational age.

  7. Date of the birth of Jesus - Wikipedia

    en.wikipedia.org/wiki/Date_of_the_birth_of_Jesus

    The earliest source stating 25 December as the date of birth of Jesus is likely a book by Hippolytus of Rome, written in the early 3rd century. He based his view on the assumption that the conception of Jesus took place at the Spring equinox which Hippolytus placed on 25 March, and then added nine months to calculate the date of birth. That ...

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