The potential of the fetus to survive outside the uterus after birth, natural or induced. Fetal viability depends largely on the fetal organ maturity, and environmental conditions.
According to Websters Encyclopedic Unabridged Dictionary of the English Language, viability of a fetus means having reached such a stage of development as to be capable of living, under normal conditions, outside the uterus. Viability exists as a function of biomedical and technological capacities, which are different in different parts of the world. As a consequence, there is, at the present time, no worldwide, uniform gestational age that defines viability.
There is no sharp limit of development, age, or weight at which a human fetus automatically becomes viable. According to studies between 2003 and 2005, 20 to 35 percent of babies born at 23 weeks of gestation survive, while 50 to 70 percent of babies born at 24 to 25 weeks, and more than 90 percent born at 26 to 27 weeks, survive. It is rare for a baby weighing less than 500g (17.6 ounces) to survive. A baby's chances for survival increases 3-4% per day between 23 and 24 weeks of gestation and about 2-3% per day between 24 and 26 weeks of gestation. After 26 weeks the rate of survival increases at a much slower rate because survival is high already.
|Completed weeks of Gestation at birth||21 and less||22||23||24||25||26||27||30||34|
|Chance of survival||0%||0-10%||10-35%||40-70%||50-80%||80-90%||>90%||>95%||>98%|
The United States Supreme Court stated in Roe v. Wade (1973) that viability (i.e., the "interim point at which the fetus becomes ... potentially able to live outside the mother's womb, albeit with artificial aid") "is usually placed at about seven months (28 weeks) but may occur earlier, even at 24 weeks." The 28-week definition became part of the "trimester framework" marking the point at which the "compelling state interest" (under the doctrine of strict scrutiny) in preserving potential life became possibly controlling, permitting states to freely regulate and even ban abortion after the 28th week. The subsequent Planned Parenthood v. Casey (1992) modified the "trimester framework," permitting the states to regulate abortion in ways not posing an "undue burden" on the right of the mother to an abortion at any point before viability; on account of technological developments between 1973 and 1992, viability itself was legally dissociated from the hard line of 28 weeks, leaving the point at which "undue burdens" were permissible variable depending on the technology of the time and the judgment of the state legislatures.
Forty-one states now have laws restricting post-viability abortions. Some allow doctors to decide for themselves if the fetus is viable. Some require doctors to perform tests to prove a fetus is pre-viable and require multiple doctors to certify the findings. Eleven states have banned the procedure called intact dilation and extraction (IDE)--also known as partial-birth abortion—in the belief that this procedure is used mainly post-viability.
Limit of viability
The limit of viability is the gestational age at which a prematurely born fetus/infant has a 50% chance of long-term survival outside its mother's womb. With the support of neonatal intensive care units, the limit of viability in the developed world has declined since 50 years ago, but has remained unchanged in the last 12 years. Currently the limit of viability is considered to be around 24 weeks although the incidence of major disabilities remains high at this point. Neo-natologists generally would not provide intensive care at 23 weeks, but would from 26 weeks.
 As of 2006, the two youngest children to survive premature birth are thought to be James Elgin Gill (born on 20 May 1987 in Ottawa, Canada, at 21 weeks and 5 days gestational age), and Amillia Taylor (born on 24 October 2006 in Miami, Florida, at 21 weeks and 6 days gestational age). Both children were born just under 20 weeks from fertilization.
Amillia Taylor is also often cited as the most-premature baby. She was born on 24 October 2006 in Miami, Florida, at 21 weeks and 6 days gestation, as an IVF pregnancy. At birth, she was 9 inches (22.86 cm) long and weighed 10 ounces (283 grams). She suffered digestive and respiratory problems, together with a brain hemorrhage. She was discharged from the Baptist Children's Hospital on 20 February 2007.
By 2013 Amillia was a small but normal child in kindergarten with some developmental delays. One foot is turned in slightly but that can be corrected with surgery. "She runs, she plays, she does things she’s not supposed to do." 
Factors that influence the chance of survival
There are several factors that have an impact on the chance of survival of the baby. Two notable factors are age and weight. The baby's gestational age (number of completed weeks of pregnancy) at the time of birth and the baby's weight (also a measure of growth) influence whether the baby will survive. Other major factors include race and gender. For a given weight, Black babies have a slightly better chance of survival than Caucasian, while most other races have a rate between the two. Male infants are slightly less mature and have a slightly higher risk of dying than female infants.
Several types of health problems also influence fetal viability. For example, breathing problems, congenital abnormalities or malformations, and the presence of other severe diseases, especially infection, threaten the survival of the neonate.
Other factors may influence survival by altering the rate of organ maturation or by changing the supply of oxygen to the developing fetus.
The mother's health plays a significant role in the child's viability. Diabetes in the mother, if not well controlled, slows organ maturation; infants of such mothers have a higher mortality. Severe high blood pressure before the 8th month of pregnancy may cause changes in the placenta, decreasing the delivery of nutrients and/or oxygen to the developing fetus and leading to problems before and after delivery.
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- Kaempf et al. (2006) Table of neo-natologists rescussitation advice showing gestation ages at which they have neutral positions whether they would or would not recommend rescussitation.
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- Halamek, Louis. "Prenatal Consultation at the Limits of Viability", NeoReviews, Vol.4 No.6 (2003): "most neonatologists would agree that survival of infants younger than approximately 22 to 23 weeks’ estimated gestational age [i.e. 20 to 21 weeks' estimated fertilization age] is universally dismal and that resuscitative efforts should not be undertaken when a neonate is born at this point in pregnancy."