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  2. Obstetric ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Obstetric_ultrasonography

    The most accurate measurement for dating is the crown-rump length of the fetus, which can be done between 7 and 13 weeks of gestation. After 13 weeks of gestation, the fetal age may be estimated using the biparietal diameter (the transverse diameter of the head, across the two parietal bones), the head circumference, the length of the femur ...

  3. Prenatal hormones and sexual orientation - Wikipedia

    en.wikipedia.org/wiki/Prenatal_hormones_and...

    The hormonal theory of sexuality holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation that emerges later in the individual. Prenatal hormones may be seen as the primary determinant of adult sexual orientation, or a co-factor.

  4. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    Gestational age. In obstetrics, gestational age is a measure of the age of a pregnancy taken from the beginning of the woman's last menstrual period (LMP), [ 1] or the corresponding age of the gestation as estimated by a more accurate method, if available. Such methods include adding 14 days to a known duration since fertilization (as is ...

  5. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    A pregnancy may end in a live birth, a miscarriage, an induced abortion, or a stillbirth. Childbirthtypically occurs around 40 weeks from the start of the last menstrual period(LMP), a span known as the gestational age. [4][5]This is just over nine months. Counting by fertilization age, the length is about 38 weeks.

  6. Timeline of human prenatal development - Wikipedia

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

    Gestational age: 7 weeks and 0 days until 7 weeks and 6 days old. 50–56 days from last menstruation. Embryonic age: Week nr 6. 5 weeks old. 36–42 days from fertilization. The embryo measures 13 mm ( 1⁄2 in) in length. Lungs begin to form. The brain continues to develop.

  7. Amniocentesis - Wikipedia

    en.wikipedia.org/wiki/Amniocentesis

    Amniocentesis is a medical procedure used primarily in the prenatal diagnosis of genetic conditions. [ 1] It has other uses such as in the assessment of infection and fetal lung maturity. [ 2] Prenatal diagnostic testing, which includes amniocentesis, is necessary to conclusively diagnose the majority of genetic disorders, with amniocentesis ...

  8. Prenatal testing - Wikipedia

    en.wikipedia.org/wiki/Prenatal_testing

    Prenatal testing. To monitor maternal and fetal health and progression, as well as, detect fetal abnormalities during pregnancy. Prenatal testing is a tool that can be used to detect some birth defects at various stages prior to birth. Prenatal testing consists of prenatal screening and prenatal diagnosis, which are aspects of prenatal care ...

  9. Teenage pregnancy - Wikipedia

    en.wikipedia.org/wiki/Teenage_pregnancy

    Teenage pregnancy, also known as adolescent pregnancy, is pregnancy in a female and trans male adolescent under the age of 20. Worldwide, pregnancy complications are the leading cause of death for women and girls 15 to 19 years old. [ 3] The definition of teenage pregnancy includes those who are legally considered adults in their country. [ 2]

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