Trimester

Definition - What does Trimester mean?

A trimester is a stage of pregnancy lasting three months.

FertilitySmarts explains Trimester

Pregnancy lasts roughly nine months (or 40 gestational weeks) and is divided into three trimesters:

  • First trimester - first three months (1-12 gestational weeks)
  • Second trimester - middle three months (12-28 gestational weeks)
  • Third trimester - last three months (28-40 gestational weeks)
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