Preterm labor is classified as labor that begins after which week?

Preterm labor is specifically defined as labor that occurs after the 20th week of pregnancy and before the completion of the 37th week. This definition is crucial as it helps in understanding the stages of pregnancy and the risks associated with premature birth. The classification of preterm labor is significant for healthcare providers to manage the pregnancy appropriately and provide necessary interventions to prolong it if possible, ensuring better outcomes for both the mother and the baby.

The 20th week serves as a critical threshold because it marks the point when the fetus has developed enough to potentially survive with medical assistance if born preterm. Understanding this timeline helps in educating expectant mothers about signs of labor and when to seek medical attention, thereby enhancing maternal and fetal health outcomes.