The third trimester of pregnancy generally starts at week 28 and lasts until the baby is born, which is usually around week 40.
Breakdown of Trimesters:
- First trimester: Weeks 1 to 12
- Second trimester: Weeks 13 to 27
- Third trimester: Weeks 28 to 40 (or until delivery)
So, the third trimester covers approximately weeks 28 through 40 of pregnancy.
