Prematurity is defined as a birth that occurs before 37 completed weeks (less than 259 days) of gestation.
Read moreDifferent degrees of prematurity are defined by gestational age (GA), which is calculated from the first day of the mother's last period, or birthweight (BW).
Read moreApproximately 550,000 premature infants are born each year. In 2008, about 12.3 percent of all live births were <37 weeks GA and 2 percent <32 weeks GA. Low birth weight (LBW) infants accounted for 8.2 percent of live births in both 2007 and 2008.
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