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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]
Between 2010 and 2014, babies in the United States had an approximately 70% survival rate when born under weight of 500 g (1.10lb), an increase from a 30.8% survival rate between 2006 and 2010. [15] 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 ...
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]
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Weighing 11.9 ounces at 21 weeks, Richard Scott William Hutchinson, of Minnesota, broke the Guinness record as the most premature baby to survive.
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]
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The survival rate in these countries for infants born before 28 weeks of gestation is 10%, compared with a 90% survival rate in high-income countries. [28] In the United States, the period from 1980 to 2000 saw a decrease in the total number of infant mortality cases, despite a significant increase in premature births. [29]