Definition of Prematurity

Reviewed on 3/29/2021

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).

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Conception: The Amazing Journey from Egg to Embryo See Slideshow

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