The second trimester of pregnancy generally starts at week 13 and lasts until about week 26 to 28, depending on the source. It is considered the middle part of the pregnancy and typically corresponds to months 4 through 6. Specifically:
- One source defines the second trimester as from week 13 to week 28.
- Another source notes it as weeks 13 to 26.
- Others describe it spanning from week 13 through week 27 or 27 weeks and 6 days, ending just before the third trimester begins at week 28.
During this period, many expectant mothers experience reduced morning sickness and fatigue compared to the first trimester, and the baby undergoes significant growth and development. In summary, the second trimester is from around week 13 up to around week 26 to 28 of pregnancy.
