According to a book written in 2009, the rates of survival for premature babies:
23 weeks – 33%
24 weeks – 50%
28 weeks – 95%
Lauri S Friedman. Abortion (San Diego, CA: Reference Point Press 2009)

Ads for clinics that do abortions after the baby can survive.
Another source says that the youngest baby born to survive was even younger: Kenya King, born in Plantation, Florida at 21 Weeks. She weighed 510 g “18 ounces” 10.5 inches Her story was in the Miami Herald.
JC Willke “Why Can’t We Love Them Both: Questions and Answers about Abortion” “Hayes publishing company and company” Cincinnati Ohio 1997 P91



