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There are three main developmental stages of pregnancy: first, second and third trimesters. Many things happen in the development of a fetus. From the moment the fertilization happens through birth, there are different areas of the baby's anatomy that develop and function in each stage. Knowing what goes on in each stage can help the physicians and the parents in calculating and anticipating the arrival of the baby. Furthermore, using advanced medical technologies, the doctors can determine if the baby is developing normally or not.