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FAQ173, June 2016
When is a baby considered “preterm” or “extremely preterm?” A normal pregnancy with one baby lasts about 40 weeks. Babies born before 37 completed weeks of pregnancy are called “preterm” or “premature.” Babies born before 28 completed weeks of pregnancy are considered extremely preterm. The earlier a baby is born, the less likely he or she is to survive. Those who do survive often have serious, sometimes long-term health problems and disabilities.