What is the definition of preterm birth (PTB)?

• A. Birth after 40 weeks gestation
• B. Birth between 34-36 weeks gestation
• C. Birth before 37 weeks gestation
• D. Birth at exactly 37 weeks gestation

Answer: (C)

Preterm birth (PTB) is defined as birth that occurs before 37 weeks of gestation. This classification is crucial in obstetrics and pediatrics because it helps in assessing the risk of complications for both the newborn and the mother. Infants born preterm are at a higher risk for various health issues, including respiratory distress syndrome, feeding difficulties, and longer hospital stays. Understanding this definition is essential for medical professionals to provide adequate care, monitor at-risk pregnancies, and implement preventive strategies for preterm births.

The other options describe different gestational periods but do not align with the established definition of preterm birth. Birth after 40 weeks is classified as postterm, while birth at exactly 37 weeks is generally considered term. Birth between 34-36 weeks falls into a category of late preterm but still does not encompass the full definition of preterm birth, which broadly captures all instances before 37 weeks. Hence, recognizing that preterm birth encompasses any delivery before reaching the 37-week mark is key to understanding its implications in perinatal health.