Perinatal Terminology ACC/AHA Pediatric and Congenital Cardiology EHR Terminology NICHD Terminology Pregnancy Outcome Preterm Birth Pre-Term ACC/AHA C92861 Finding Preterm Birth Preterm NICHD Preterm Delivery Premature delivery Birth at less than 37 weeks and 0 days gestation. CTCAE C4011994 Preterm Birth Birth when a fetus is less than 37 weeks and 0 days gestational age. Gestation that is less than 37 wks. and 0 days' gestational age. A disorder characterized by delivery of a viable infant before the normal end of gestation. Typically, viability is achievable between the twentieth and thirty-seventh week of gestation.