Which of the following is NOT a predisposing factor for RDS?

Respiratory Distress Syndrome (RDS) is primarily associated with immaturity of the lungs, typically seen in preterm infants. Key predisposing factors include conditions that affect lung development and overall infant maturity.

Maternal diabetes can increase the risk of RDS due to the potential for increased fetal insulin production, leading to respiratory issues. Similarly, being a second-born twin can contribute to RDS because the first-born may have compromised resources and lung development, and the second twin often has less space and time for lung maturation.

Prematurity is a well-known risk factor for RDS, as infants born before 34 weeks gestation have not fully developed their surfactant-producing cells, leading to increased incidence of the condition.

Maternal hypertension, while it presents risks for various pregnancy-related complications, does not directly impact lung development in the same way as the other factors. Thus, the correct selection reflects that while maternal hypertension is a concern in pregnancy, it is not recognized as a direct predisposing factor for RDS.