What term is used to refer to the three periods of pregnancy?

The term "trimesters" is used to refer specifically to the three periods of pregnancy, each lasting about three months. This division helps to organize the developmental stages of the fetus and the changes occurring in the mother. Each trimester is associated with different milestones and significant developments during pregnancy.

The first trimester focuses on the early stages of fetal growth and the establishment of vital organs. The second trimester typically marks a period of rapid growth and development, while the third trimester is concentrated on final growth and preparation for birth. Understanding these periods is crucial for both maternal health monitoring and prenatal care.

The other terms listed do not accurately describe the three distinct periods of pregnancy. "Phases" and "stages" are more general terms that could be used in various contexts but do not specifically indicate the timeframe or unique developments associated with pregnancy. "Quarters," on the other hand, is not a standard term used in the context of pregnancy and does not effectively represent the structured progression through the trimesters.