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  2. Timeline of human prenatal development - Wikipedia

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

    Embryonic age: Week nr 4. 3 weeks old. 22–28 days from fertilization. The embryo measures 4 mm (1 ⁄ 8 in) in length and begins to curve into a C shape. The heart bulges, further develops, and begins to beat in a regular rhythm. Septum primum appears. [1] Pharyngeal arches, grooves which will form structures of the face and neck, form.

  3. 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 ...

  4. 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).

  5. Fetal viability - Wikipedia

    en.wikipedia.org/wiki/Fetal_viability

    As of 2022, the world record for the lowest gestational age newborn to survive is held by Curtis Zy-Keith Means, who was born on 5 July 2020 in the United States, at 21 weeks and 1 day gestational age, weighing 420 grams. [5] A preterm birth, also known as premature birth, is defined as babies born alive before 37 weeks of pregnancy are ...

  6. Prenatal care in the United States - Wikipedia

    en.wikipedia.org/wiki/Prenatal_care_in_the...

    Monthly visits to a health care professional for weeks 1 through 28 -(up to month 7) Visits twice a month from 28 to 36 weeks of pregnancy -(the 7th and 8th month) Weekly after week 36 (delivery at week 38–40)-(After the 8th month) More frequent visits are warranted for women older than 35 or in case of a high risk pregnancy, [1] with the ...

  7. Maternal physiological changes in pregnancy - Wikipedia

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

    From about the 16th week of pregnancy the breasts are able to begin to produce milk. ... (4.1–8.3) 75 5.7 (4.6–7.2) Trimester 3 ... It begins between the 4 and 8 ...

  8. Villitis of unknown etiology - Wikipedia

    en.wikipedia.org/wiki/Villitis_of_unknown_etiology

    VUE is more common than infectious villitis; Infectious villitis is present in approximately 14 births per 1000 births. VUE is present in approximately 76–136 births per 1000 births. VUE occurs in the term placenta, in the late third trimester of pregnancy. Infectious villitis occurs at the early-third to late-second trimester of

  9. Amniotic fluid index - Wikipedia

    en.wikipedia.org/wiki/Amniotic_fluid_index

    Median AFI level is approximately 14 cm from week 20 to week 35, [6] when the amniotic fluid begins to reduce in preparation for birth. An AFI smaller than 5–6 cm is considered as oligohydramnios. [3] The exact number can vary by gestational age. The fifth percentile for gestational age is sometimes used as a cutoff value. [7]

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