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When does each trimester begin?

The duration of pregnancy is divided in to three time periods called trimesters . The definitions of trimesters according to the 10th revision of the InternationalStatistical Classification of Diseases and Related Health Problems are:

  • First Trimester Less than 14 weeks, 0 days

  • Second Trimester 14 weeks, 0 days through 27 weeks and 6 days

  • Third Trimester 28 weeks through delivery


The Centers for Medicare & Medicaid Services, CMS, Accessed 11/21/2015


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