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  2. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    Timeline of pregnancy, including (from top to bottom): Trimesters, embryo/fetus development, gestational age in weeks and months, viability and maturity stages Estimation of due date Distribution of gestational age at childbirth among singleton live births, given both when gestational age is estimated by first trimester ultrasound and directly ...

  3. Prenatal development - Wikipedia

    en.wikipedia.org/wiki/Prenatal_development

    Prenatal development (from Latin natalis 'relating to birth') involves the development of the embryo and of the fetus during a viviparous animal 's gestation. Prenatal development starts with fertilization, in the germinal stage of embryonic development, and continues in fetal development until birth . In human pregnancy, prenatal development ...

  4. Human embryonic development - Wikipedia

    en.wikipedia.org/wiki/Human_embryonic_development

    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 40 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in ...

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

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

    Pregnancy Symptoms Week 1. It's a bit of a mind-bender, but you aren't actually pregnant during what doctors call "week one" of pregnancy. Instead, week one starts on the first day of your last ...

  6. Fetus - Wikipedia

    en.wikipedia.org/wiki/Fetus

    A human fetus, attached to placenta, at three months gestational age. In humans, the fetal stage starts nine weeks after fertilization. [8] At the start of the fetal stage, the fetus is typically about 30 millimetres ( in) in length from crown-rump, and weighs about 8 grams. [8] The head makes up nearly half of the size of the fetus. [9]

  7. 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 ...

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