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The chance of survival at 22 weeks is about 6%, while at 23 weeks it is 26%, 24 weeks 55% and 25 weeks about 72% as of 2016. [189] With extensive treatment up to 30% of those who survive birth at 22 weeks survive longer term as of 2019. [190] The chances of survival without long-term difficulties is less. [24]
A baby's chances for survival increases 3 to 4 percentage points per day between 23 and 24 weeks of gestation, and about 2 to 3 percentage points per day between 24 and 26 weeks of gestation. After 26 weeks the rate of survival increases at a much slower rate because survival is high already. [16]
According to studies between 2003 and 2005, 20 to 35 percent of babies born at 23 weeks of gestation survive, while 50 to 70 percent of babies born at 24 to 25 weeks, and more than 90 percent born at 26 to 27 weeks, survive. [14] It is rare for a baby weighing less than 500 g (17.6 ounces) to survive. [13]
Weighing 11.9 ounces at 21 weeks, Richard Scott William Hutchinson, of Minnesota, broke the Guinness record as the most premature baby to survive.
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Doctors believe 'kangaroo care' may have helped little Elsie Dutton survive after she was born weighing just 1lb 2oz. Premature baby born at 23 weeks saved by mum’s cuddles Skip to main content
Today, infants of 500 grams (1.1 pounds) at 26 weeks have a fair chance of survival. As of 2022, the world record for the lowest gestational age newborn to survive is held by Curtis Zy-Keith Means, who was born on July 5, 2020 in the United States, at 21 weeks and 1 day gestational age, weighing 420 grams (0.93 pounds). [23]
Preterm birth around 26 weeks frequently results in severe respiratory distress, although with current medical advancements, some babies may survive. Prior to 26 weeks, sufficient pulmonary surfactant is not produced, and the surfaces for gas exchange have not formed adequately; therefore, survival is low.