There is no sharp limit of development, age, or weight at which a fetus automatically becomes viable.[24] According to data from 2003–05, survival rates are 20–35% for babies born at 23 weeks of gestation (5-3/4 months); 50–70% at 24-25 weeks (6 - 6-1/4 months); and >90% at 26-27 weeks (6-1/2 - 6-3/4 months) and over.[25] It is rare for a baby weighing less than 1.1 pounds (0.50 kg) to survive.[24]