Respiratory morbidity in late preterm twin infants.

Purpose: Antenatal corticosteroids have been shown to decrease neonatal respiratory morbidity in singleton pregnancies when given during the late-preterm period (34-36 weeks). Whether these findings also apply to late-preterm twins, who account for approximately one-third of infants born at 34-35 weeks, is currently unclear. The answer to this question depends, in part, on whether the risk of respiratory morbidity among late-preterm twin infants is similar to that observed in late-preterm singletons.