At what point in pregnancy does the fetus become viable?
The point in pregnancy after which a fetus is capable of living outside the womb is known as “viability.” As medical technology has improved, that point has been pushed back earlier and earlier in pregnancy. Babies born as early as 24 weeks routinely survive with medical assistance, and some have survived as early as 22 weeks.
Wikipedia contributors. “Fetal viability.” Wikipedia, The Free Encyclopedia. Accessed October 17, 2013. http://en.wikipedia.org/w/index.php?title=Fetal_viability&oldid=574028828.