Final answer:
Respiratory Distress Syndrome (RDS) primarily occurs in premature infants. The upper limit of gestational age at which an infant can develop RDS is around 31 weeks.
Step-by-step explanation:
Respiratory Distress Syndrome (RDS) primarily occurs in infants born prematurely. Up to 50 percent of infants born between 26 and 28 weeks and fewer than 30 percent of infants born between 30 and 31 weeks develop RDS. RDS is caused by insufficient production of pulmonary surfactant, which prevents the lungs from properly inflating at birth. The upper limit of gestational age at which an infant can develop RDS is around 31 weeks.