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  2. Fetal viability - Wikipedia

    en.wikipedia.org/wiki/Fetal_viability

    Fetal viability is the ability of a human fetus to survive outside the uterus. Viability depends upon factors such as birth weight, gestational age, and the availability of advanced medical care. In low-income countries, more than 90% of extremely preterm newborns (less than 28 weeks gestational age) die due to a lack of said medical care; in ...

  3. 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.

  4. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    Frequency. 213 million (2012) [11] Deaths. 230,600 (2016) [12] Pregnancy is the time during which one or more offspring develops ( gestates) inside a woman 's uterus (womb). [4] [13] A multiple pregnancy involves more than one offspring, such as with twins. [14]

  5. A week-by-week guide to common pregnancy symptoms - AOL

    www.aol.com/week-week-guide-common-pregnancy...

    Here's a guide to pregnancy stages and symptoms of pregnancy week by week: ... symptoms during the second month, which starts at week ... lungs really kicks into high gear. Pregnancy Symptoms Week 24.

  6. Gestational age - Wikipedia

    en.wikipedia.org/wiki/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 possible in in vitro ...

  7. Human embryonic development - Wikipedia

    en.wikipedia.org/wiki/Human_embryonic_development

    Embryonic development in the human, covers the first eight weeks of development; at the beginning of the ninth week the embryo is termed a fetus. The eight weeks have 23 stages. Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or ...

  8. 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 ...

  9. Gestation - Wikipedia

    en.wikipedia.org/wiki/Gestation

    Gestation. Drawing of a fetus in utero. Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). [1] It is typical for mammals, but also occurs for some non-mammals. Mammals during pregnancy can have one or more gestations at the same time, for ...

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