Between 20 to 35 percent of human babies born at 24 weeks of gestation survive. That figure rises to between 50 and 70 percent of babies born at 25 weeks. Approximately 90 percent born at 26 to 27 weeks, survive. It is rare for a baby weighing less than 500 g (17.6 ounces) to survive.
Baby Saybie was born at 23 weeks and weighed 8.6 ounces about as much as a large apple. She is the youngest human being on record born before the full normal gestation period of 40 weeks.
Earlier this week hospital officials say Saybie was discharged as a healthy 5-pound infant.