< b>Infant, post-term: An overly mature baby that has not been born until
well after the usual term pregnancy. A post-term baby is specifically one 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 a very important calculation since, if delivery is delayed 3 weeks
beyond term, the infant mortality rate skyrockets to 3 times normal.
The definition of a post-term infant has evolved. A few sources still consider
a baby post-term if it is born a week after the usual 9 months' gestation but the
current trend is to consider a baby post-term only if it is born 2 weeks (14 days)
or more after the usual full-term 9 months of gestation.
The terms "post-term infant" and "postmature infant" are interchangeable.
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