The second trimester spans which weeks?

• A. 1-13 weeks
• B. 14-28 weeks
• C. 28-40 weeks
• D. 8-20 weeks

Answer: (B)

The second trimester is the middle portion of pregnancy, roughly the middle third of gestation. In most obstetric frameworks, it runs from about week 14 through week 28. Beginning at week 14 aligns with the late first-trimester boundary and the period when ultrasound anatomy becomes clearer, while ending at week 28 marks the transition toward the third trimester as fetal growth continues and preparation for viability and birth progresses. Therefore, 14–28 weeks best fits this middle period. The other ranges either fall in the first trimester, extend into the late pregnancy, or span across the boundary, so they don’t describe the middle third.