According to a pediatrics website:
survival is nearly impossible at or below 22 weeks gestation.
Between 23-26 weeks gestation, survival increases markedly.
At 23 weeks, overall survival is usually less than 25%.
Between 24-25 weeks, survival increases to about 50-60%.
By 26 weeks, gestation survival is over 80%.
The main problem is lung development for premature babies, because if they are too early they can't even be kept alive in incubators. It also says "the average cost of a hospital stay for a surviving infant born before 26 weeks gestation is $250,000." what happens in the usa when someone doesnt have health insurance? Or if someone was planning to give up for adoption, who pays the cost? (i'm not wearing my pro-choice hat here!!! I'm actually genuinely curious how things work in a country wihtout a national health service?)