Infant, post-term:A post-term infant refers to a baby that is born significantly later than the typical duration of a pregnancy. Specifically, a post-term baby is one that arrives 14 days or more after the standard gestation period of 9 months (280 days). This gestation period is calculated from the date of the(). Accurate calculation is crucial because if the birth is delayed by 3 weeks beyond the due date, the infant mortality rate increases to three times the normal rate. The definition of a post-term infant has changed over time. While some sources still define a baby as post-term if born just a week past the 9-month gestation, the prevailing view now considers a baby post-term only if it is born 14 days or more after the normal full-term period. The terms "post-term infant" and "postmature infant" are used interchangeably.