when does 3rd trimester start

The third trimester of pregnancy starts at week 28 and lasts until the birth, typically around week 40. This trimester represents the final three months (or weeks 28 to 40) of pregnancy, during which the fetus grows rapidly and prepares for birth. Most healthcare providers consider the start of the third trimester to be from the 28th week of pregnancy, though some sources mention week 27 as a possible start. The third trimester is marked by increased prenatal visits to monitor the health of the mother and fetus, and symptoms such as shortness of breath and Braxton Hicks contractions may become noticeable.