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  2. Quickening - Wikipedia

    en.wikipedia.org/wiki/Quickening

    Quickening indicates the start of fetal movements, usually felt 14–26 weeks after conception, or between the fourth and sixth month. [ 5 ] [ 6 ] A woman pregnant for the first time (i.e., a primigravida woman) typically feels fetal movements at about 20–21 weeks, whereas a woman who has given birth at least once will typically feel ...

  3. Fetal movement - Wikipedia

    en.wikipedia.org/wiki/Fetal_movement

    In addition to sideward bendings of the head, complex and generalized movements occur at the beginning of the fetal stage, with movements and startles that involve the whole body. [11] Movement of hands, hips and knees have been observed at nine weeks, [12] stretches and yawns at ten weeks, [13] and isolated limb movements beginning shortly ...

  4. Fetus - Wikipedia

    en.wikipedia.org/wiki/Fetus

    A woman pregnant for the first time (nulliparous) typically feels fetal movements at about 21 weeks, whereas a woman who has given birth before will typically feel movements by 20 weeks. [13] By the end of the fifth month, the fetus is about 20 cm (8 in) long.

  5. Obstetric ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Obstetric_ultrasonography

    3D Ultrasound of fetal movements at 12 weeks. 75-mm fetus (about 14 weeks' gestational age) Fetus at 17 weeks. Fetus at 20 weeks. Medical uses. Early pregnancy

  6. Development of the respiratory system - Wikipedia

    en.wikipedia.org/wiki/Development_of_the...

    Although the function of fetal breathing movements is not entirely clear, they can be observed starting at 20–21 weeks of development. Fetal breathing movements involve muscle contractions that cause the inhalation of amniotic fluid and exhalation of the same fluid, with pulmonary surfactant and mucus.

  7. Beginning of human personhood - Wikipedia

    en.wikipedia.org/wiki/Beginning_of_human_personhood

    For them, fetal motion can sometimes be felt as early as 14 weeks, [43] although it is usually around 18 weeks. A woman who has not previously given birth typically feels fetal movements at about 20–21 weeks. [44] Some early abortion laws were based around this standard.

  8. Biophysical profile - Wikipedia

    en.wikipedia.org/wiki/Biophysical_profile

    Less than two accelerations to satisfy the test in 20 minutes US: Fetal breathing movements At least one episode of > 30s or >20s [3] in 30 minutes None or less than 30s or 20s [3] US: Fetal activity / gross body movements At least three discrete body/limb movement in 30 minutes (episodes of active continuous movement considered a single movement.

  9. Timeline of human prenatal development - Wikipedia

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

    Embryonic age: Week nr 7. 6 weeks old. 43–49 days from fertilization. The embryo measures 18 mm (3 ⁄ 4 in) in length. Fetal heart tone (the sound of the heart beat) can be heard using doppler. Nipples and hair follicles begin to form. Location of the elbows and toes are visible. Spontaneous limb movements may be detected by ultrasound.

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