Birth of the baby before week 37 of pregnancy.

Pre-term birth of a child born less than 30 weeks gestation.(one who was forced out/premature birth)

Underdevelopment; the condition of an infant born too soon. Refers to infants delivered before 37 weeks from the first day of the last menstrual period.

The quality or state of being premature; early, or untimely, ripeness; as, the prematurity of genius.

The condition of a fetus weighing between 1,000 and 2,499 grams.