When does the third trimester begin?

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Multiple Choice

When does the third trimester begin?

Explanation:
The boundary between second and third trimesters is at 27 weeks of gestation. Pregnancy is counted from the first day of the last menstrual period and lasts about 40 weeks. First trimester runs roughly 0–12 weeks, second roughly 13–26 weeks, and the third starts at 27 weeks and continues until delivery. So the third trimester begins at 27 weeks.

The boundary between second and third trimesters is at 27 weeks of gestation. Pregnancy is counted from the first day of the last menstrual period and lasts about 40 weeks. First trimester runs roughly 0–12 weeks, second roughly 13–26 weeks, and the third starts at 27 weeks and continues until delivery. So the third trimester begins at 27 weeks.

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