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  2. Pregnancy over age 50 - Wikipedia

    en.wikipedia.org/wiki/Pregnancy_over_age_50

    Pregnancy over age 50. Italian singer Gianna Nannini was 56 years old when she gave birth in 2010. Pregnancy over the age of 50 has become possible for more women because of advances in assisted reproductive technology, in particular egg donation. Typically, a woman's fecundity ends with menopause, which, by definition, is 12 consecutive months ...

  3. 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 ...

  4. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    The second trimester is defined as starting, between the beginning of week 13 (12 weeks +0 days of GA) [4] and beginning of week 15 (14 weeks + 0 days of GA). [36] It ends at the end of week 27 (26 weeks + 6 days of GA) [ 36 ] or end of week 28 (27 weeks + 6 days of GA).

  5. Timeline of human prenatal development - Wikipedia

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

    Gestational age: 3 weeks and 0 days until 3 weeks and 6 days old. 22–28 days from last menstruation. Embryonic age: Week nr 2. 1 week old. 8–14 days from fertilization. Trophoblast cells surrounding the embryonic cells proliferate and invade deeper into the uterine lining. They will eventually form the placenta and embryonic membranes.

  6. List of mammalian gestation durations - Wikipedia

    en.wikipedia.org/wiki/List_of_mammalian...

    List of mammalian gestation durations. This is a collection of lists of mammal gestation period estimated by experts in their fields. The mammals included are only viviparous ( marsupials and placentals) as some mammals, which are monotremes (including platypuses and echidnas) lay their eggs. A marsupial has a short gestation period, typically ...

  7. Preterm birth - Wikipedia

    en.wikipedia.org/wiki/Preterm_birth

    Preterm birth, also known as premature birth, is the birth of a baby at fewer than 37 weeks gestational age, as opposed to full-term delivery at approximately 40 weeks. [ 1] Extreme preterm [ 2] is less than 28 weeks, very early preterm birth is between 28 and 32 weeks, early preterm birth occurs between 32 and 34 weeks, late preterm birth is ...

  8. Gravidity and parity - Wikipedia

    en.wikipedia.org/wiki/Gravidity_and_parity

    A female who has given birth two, three, or four times is multiparous and is called a multip. Grand multipara describes the condition of having given birth five or more times. [12] Like gravidity, parity may also be counted. A female who has given birth one or more times can also be referred to as para 1, para 2, para 3, and so on.

  9. Vaginal delivery - Wikipedia

    en.wikipedia.org/wiki/Vaginal_delivery

    A vaginal delivery is the birth of offspring in mammals (babies in humans) through the vagina (also called the "birth canal"). [1] It is the most common method of childbirth worldwide. [ 2 ] It is considered the preferred method of delivery, as it is correlated with lower morbidity and mortality than caesarean sections (C-sections), [ 3 ...