Incidence of Preterm Labor

Medically reviewed by Alison Stuebe, Department of Maternal-Fetal Medicine, Brigham and Women's Hospital, Boston, MAWritten by the Healthline Editorial Team on March 15, 2012

Preterm delivery occurs in about one out of every eight pregnancies. Among all preterm deliveries, about 75% are due to preterm labor of unknown cause.

CMS Id: 15930