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Gestational age is a measure of the age of a pregnancy taken from the beginning of the woman's last menstrual period or other methods. It is used for various purposes such as prenatal development, delivery date, fetal viability and postnatal risk factors.
Superfecundation is the fertilization of two or more ova from the same cycle by sperm from separate acts of sexual intercourse. It can lead to heteropaternal superfecundation, where twins have different fathers, as in some cases of animals and humans.
Gravidity is the number of times a female has been pregnant, regardless of the outcome. Parity is the number of births where pregnancies reached viable gestational age. Learn more about these terms and their implications for human and animal health.
This web page provides a comprehensive list of all sovereign states and dependencies by total fertility rate (TFR), the expected number of children born per woman in her child-bearing years. It also includes methodology, replacement rates, comparison and forecast/prediction lists, and sources for each ranking.
Learn about the use of medical ultrasound in pregnancy, including types, medical uses, history, safety issues and more. Find out how ultrasound can provide information about the health of the mother, the timing and progress of the pregnancy, and the health and development of the embryo or fetus.
A natural family planning method based on cervical mucus observations to track fertility. It can be used for avoiding or achieving pregnancy, and is associated with the Pope Paul VI Institute and Catholic teachings.
Struggling to conceive can be a painful experience, leaving many hopeful parents feeling frustrated, discouraged, and vulnerable. Whether you fall into this camp and the words "fertility massage ...
Learn about the history, terminology and effectiveness of the rhythm method and other calendar-based methods of estimating fertility. The rhythm method is a type of natural family planning that tracks menstrual cycle length and avoids intercourse on fertile days.
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