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  2. Gestation - Wikipedia

    en.wikipedia.org/wiki/Gestation

    The first trimester is from the last menstrual period through the 13th week, the second trimester is 14th–28/29th week, and the third trimester is 29/30th–42nd week. [6] Birth normally occurs at a gestational age of about 40 weeks, though it is common for births to occur from 37 to 42 weeks. [6] Labor occurring prior to 37 weeks gestation ...

  3. 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). [37] It ends at the end of week 27 (26 weeks + 6 days of GA) [ 37 ] or end of week 28 (27 weeks + 6 days of GA).

  4. Timeline of human prenatal development - Wikipedia

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

    Embryonic age: 10 weeks and 0 days until 13 weeks and 6 days old. The fetus reaches a length of about 15 cm (6 in). A fine hair called lanugo develops on the head. Fetal skin is almost transparent. More muscle tissue and bones have developed, and the bones become harder. The fetus makes active movements. Sucking motions are made with the mouth.

  5. Maternal physiological changes in pregnancy - Wikipedia

    en.wikipedia.org/wiki/Maternal_physiological...

    These changes occur mostly in the second trimester and prior to 32 weeks gestation. ... 14.2 (13.2–15.3) ... by 40% in the first trimester via an increase in ...

  6. 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 ...

  7. Signs and symptoms of pregnancy - Wikipedia

    en.wikipedia.org/wiki/Signs_and_symptoms_of...

    Low back pain and pelvic girdle pain – Pregnancy-related low back pain (PLBP) and pregnancy-related pelvic girdle pain (PGP) are common conditions occurring in an estimated 45% of pregnant women and 25% of postpartum women. [13] Most of the literature does not distinguish between PLBP and PGP as since their precise definitions often overlap ...

  8. Fetal movement - Wikipedia

    en.wikipedia.org/wiki/Fetal_movement

    Also starting about week 12, the thoracic diaphragm moves up and down as if the fetus were breathing, but this movement disappears about week 16 and does not resume until the third trimester. [16] Movements such as kicking continue, and the mother usually feels movement for the first time, an event called quickening, during the fifth month. [17]

  9. Obstetrics - Wikipedia

    en.wikipedia.org/wiki/Obstetrics

    A second blood screen at 15 to 20 weeks refines the risk more accurately. [13] The cost is higher than an "AFP-quad" screen due to the ultrasound and second blood test, but it is quoted to have a 93% pick up rate as opposed to 88% for the standard AFP/QS. This is an evolving standard of care in the United States. [14] [15] [16] Down syndrome ...

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