Asides

How long is a trimester?

October 1, 2008 ⋅  Print This Post ⋅ Post a comment

Back when pregnancies were considered 9 months long, “trimester” meant three months. A normal full-term pregnancy is now defined as about 40 weeks. Divide that into three you get trimesters of 13 and half weeks, just a little over 3 months.