There is no sharp limit of development, age, or weight at which a fetus becomes viable.
[15] A 2015 study found that even with active treatment, no infants born at less than 22 weeks survived, but an infant born at 21 weeks and one day in April of 2021 did survive his premature birth.
[16] At 23 weeks survival without severe impairment is less than 2%, and at 25 weeks, up to 30% might survive without severe impairment.
[17][18] According to studies between 2003 and 2005,
[19][20][21] 20 to 35 percent of babies born at 24
weeks of gestation survived, while 50 to 70 percent of babies born at 25 weeks, and more than 90 percent born at 26 to 27 weeks, survived.
[18] Because the chance of survival is variable based on interventions available and the weight and sex of the fetus, there is no consensus on viability. The American College of Obstetricians and Gynecologists reports that 23% of abortion providers offer abortions at 20 weeks of gestation and later, most often using a method called dilation and evacuation (D&E).
[22]