Issues in pregnancy dating revisiting the evidence
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The most common system used among healthcare professionals is Naegele's rule, which estimates the expected date of delivery (EDD) by adding a year, subtracting three months, and adding seven days to the first day of a woman's last menstrual period (LMP) or corresponding date as estimated from other means.
There is no sharp limit of development, gestational age, or weight at which a human fetus automatically becomes viable.
Babies who were less than 28 weeks of gestational age, or weighed less than 1000 grams, or less than 35 cm in length – even if they showed some sign of life (breathing, heartbeat, voluntary muscle movement) – were classified as "live fetuses" rather than "live births." Only if such newborns survived seven days (168 hours) were they then classified as live births.
If, however, they died within that interval, they were classified as stillbirths.
The popularity of using such a definition of gestational age is that menstrual periods are essentially always noticed, while there is usually a lack of a convenient way to discern when fertilization occurred.
The initiation of pregnancy for the calculation of gestational age can be different from definitions of initiation of pregnancy in context of the abortion debate or beginning of human personhood.
A 2013 study found that "While only a small proportion of births occur before 24 completed weeks of gestation (about ), survival is rare and most of them are either fetal deaths or live births followed by a neonatal death." Gestational age (as well as fertilization age) is sometimes used postnatally (after birth) to estimate various risk factors.
For example, it is a better predictor than postnatal age for risk of intraventricular hemorrhage in premature babies treated with extracorporeal membrane oxygenation.
If they survived that interval but died within the first 365 days they were classified as infant deaths.Tags: Adult Dating, affair dating, sex dating