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  2. Fetal viability - Wikipedia

    en.wikipedia.org/wiki/Fetal_viability

    A baby's chances for survival increases 3 to 4 percentage points per day between 23 and 24 weeks of gestation, and about 2 to 3 percentage points per day between 24 and 26 weeks of gestation. After 26 weeks the rate of survival increases at a much slower rate because survival is high already. [16]

  3. Timeline of human prenatal development - Wikipedia

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

    Embryonic age: Week nr 33. 32 weeks old. The fetus reaches a length of about 40–48 cm (16–19 in). The fetus weighs about 2.5 to 3 kg (6 lb 10 oz)to 6 lb 12 oz). Lanugo begins to disappear. Body fat increases. Fingernails reach the end of the fingertips. A baby born at 36 weeks has a high chance of survival, but may require medical ...

  4. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    A baby's chances for survival increases 3–4% per day between 23 and 24 weeks of gestation and about 2–3% per day between 24 and 26 weeks of gestation. After 26 weeks the rate of survival increases at a much slower rate because survival is high already. [15] Prognosis depends also on medical protocols on whether to resuscitate and ...

  5. Human embryonic development - Wikipedia

    en.wikipedia.org/wiki/Human_embryonic_development

    Human embryonic development covers the first eight weeks of development, which have 23 stages, called Carnegie stages. At the beginning of the ninth week, the embryo is termed a fetus (spelled "foetus" in British English). In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs.

  6. Prenatal development - Wikipedia

    en.wikipedia.org/wiki/Prenatal_development

    The first ten weeks of gestational age is the period of embryogenesis and together with the first three weeks of prenatal development make up the first trimester of pregnancy. From the 10th week of gestation (8th week of development), the developing embryo is called a fetus.

  7. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    23 weeks Childbirth: 39–40 weeks 37–38 weeks [33]: 108 ... Stillbirth is defined as fetal death after 20 or 28 weeks of pregnancy, depending on the source. It ...

  8. Fetus - Wikipedia

    en.wikipedia.org/wiki/Fetus

    The duration of gestation in placental mammals varies from 18 days in jumping mice to 23 months in elephants. [43] Generally speaking, fetuses of larger land mammals require longer gestation periods. [43] Fetal stage of a porpoise. The benefits of a fetal stage means that young are more developed when they are born.

  9. Crown-rump length - Wikipedia

    en.wikipedia.org/wiki/Crown-rump_length

    Ultrasound image of the foetus at 12 weeks of pregnancy in a sagittal scan. Measurements of fetal Crown Rump Length (CRL). The embryo and fetus float in the amniotic fluid inside the uterus of the mother usually in a curved posture resembling the letter C. The measurement can actually vary slightly if the fetus is temporarily stretching ...

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