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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 ...
In many countries, rates of premature births have increased between the 1990s and 2010s. [2] Complications from preterm births resulted globally in 0.81 million deaths in 2015, down from 1.57 million in 1990. [7] [22] 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%. [23]
A baby's chances for survival increases 3–4% per day between 23 and 24 weeks of gestation and about 2–3% 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. [15]
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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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]
Katelyn's pregnancy had been smooth until complications led her to give birth at 25 weeks. What followed was a 118-day stay in the NICU for her baby girl, Nora
This scoring allows for the estimation of age in the range of 26 weeks to 44 weeks. The New Ballard Score is an extension of the above to include extremely pre-term babies , i.e., up to 20 weeks. The scoring relies on the intra-uterine changes that the fetus undergoes during its maturation.