What are 3 stages of the trimester?

A pregnancy is typically divided into three trimesters. The first trimester spans from week 1 to week 12, during which critical development occurs, including the formation of major organs. The second trimester lasts from week 13 to week 26, marked by growth and the development of the baby's features, and often includes a decrease in early pregnancy symptoms. The third trimester, from week 27 to birth, involves further growth, preparation for delivery, and the final maturation of the baby's organs.