About a quarter of children in the United States are born two to three weeks before their due date, which qualifies them as “early term.” Pregnancies typically last 40 weeks, so you might think that being born two to three weeks early wouldn’t matter. But, children born just two or three weeks early are at slightly higher risks of respiratory problems, like asthma, later in childhood. About one in 10 children in the U.S. are born more than three weeks before their due date, which qualifies them as “preterm” and puts them at higher risks for much worse outcomes.
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Source: Phys.org