Although studies about THOP usually involves the preterm infants born at 33 weeks or earlier, one study of Paul et al. showed a decreased thyroid function in late preterm and term infants with respiratory distress syndrome as function of severity of illness. Unpublished data of our center showed also the presence of THOP, although less frequent, in the group of late preterm infants. Other data about this group of preterm infants are scarce.