Weeks to Viability

Odds of a Premature Baby's Survival by Length of Pregnancy
Length of Pregnancy Likelihood of Survival
23 weeks 17%
24 weeks 39%
25 weeks 50%
26 weeks 80%
27 weeks 90%
28-31 weeks 90-95%
32-33 weeks 95%
34+ weeks Almost as likely as a full-term baby