MEDICAL DICTIONARY
Postmaturity: Overly mature, overly developed, especially as regards a baby.
A baby born 2 weeks (14 days) or more after the usual 9 months (280 days) of gestation . The gestation (length of the pregnancy) is calculated from the date of the last menstrual period (LMP). This is an important calculation since, if delivery is delayed 3 weeks beyond term, the infant mortality rate skyrockets to 3 times normal.
The definition of a postmature infant has evolved. A few sources still consider a baby postmature if it is born a week after the usual 9 months' gestation but the current trend is to consider a baby postmature ONLY if it is born 2 weeks (14 days) or more after the usual 9 months of gestation.
The terms "postmaturity" and " post-term " are interchangeable.
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