Medical Definition of Prematurity
Prematurity: Historically, the definition of prematurity was 2500 grams (about 5 1/2 pounds) or less at birth. The current World Health Organization definition of prematurity is a baby born before 37 completed weeks of gestation, counting from the first day of the last menstrual period (LMP).
Last Editorial Review: 6/9/2016
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