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  2. Signs and symptoms of pregnancy - Wikipedia

    en.wikipedia.org/.../Signs_and_symptoms_of_pregnancy

    Although described as "morning sickness," pregnant women can experience this nausea any time of day or night. The exact cause of morning sickness remains unknown. Nausea and vomiting in pregnancy is typically mild and self-limited, resolving on its own by the 14th week of pregnancy. Other causes should also be ruled out when considering treatment.

  3. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    The mean pregnancy length has been estimated to be 283.4 days of gestational age as timed from the first day of the last menstrual period and 280.6 days when retrospectively estimated by obstetric ultrasound measurement of the fetal biparietal diameter (BPD) in the second trimester. [12]

  4. Ladin's sign - Wikipedia

    en.wikipedia.org/wiki/Ladin's_sign

    Ladin's sign is a clinical sign of pregnancy in which there is softening in the midline of the uterus anteriorly at the junction of the uterus and cervix. It occurs and is detectable with a manual examination at about 6 weeks' gestation. [1] Ladin's sign is often present during the woman's first pelvic exam when pregnancy is suspected. [2]

  5. Preterm birth - Wikipedia

    en.wikipedia.org/wiki/Preterm_birth

    He was 128 days premature, 21 weeks 5 days gestation, and weighed 624 g (1 lb 6 oz). He survived. [210] [211] In 2014, Lyla Stensrud, born in San Antonio, Texas, U.S., became the youngest premature baby in the world. She was born at 21 weeks 4 days and weighed 410 grams (less than a pound). Kaashif Ahmad resuscitated the baby after she was born.

  6. Fertility awareness - Wikipedia

    en.wikipedia.org/wiki/Fertility_awareness

    For women with very irregular cycles—such as those common during breastfeeding, perimenopause, or with hormonal diseases such as PCOS—abstinence or the use of barriers may be required for months at a time. Typical use effectiveness is lower than most other methods. [39] Fertility awareness does not protect against sexually transmitted ...

  7. Timeline of human prenatal development - Wikipedia

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

    Gestational age: 5 weeks and 0 days until 5 weeks and 6 days old. 36–42 days from last menstruation. 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.

  8. Prenatal development - Wikipedia

    en.wikipedia.org/wiki/Prenatal_development

    The term Advanced maternal age is used to describe women who are over 35 during pregnancy. [29] [30] Women who give birth over the age of 35 are more likely to experience complications ranging from preterm birth [30] [29] [31] and delivery by Caesarean section, [30] [31] to an increased risk of giving birth to a child with chromosomal ...

  9. Calendar-based contraceptive methods - Wikipedia

    en.wikipedia.org/wiki/Calendar-based...

    The standard days method is also considered a calendar-based method, because when using it, a woman tracks the days of her menstrual cycle without observing her physical fertility signs. The standard days method is based on a fixed formula taking into consideration the timing of ovulation, the functional life of the sperm and the ovum, and the ...

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