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There are three different processes in fetal development. During the first trimester, all the organ systems of the embryobegin to develop. Most of the changes that occur to the fetus during the second
trimester involve body growth. During the fourth month, thefetus grows rapidly. During the last three months, the body mass of the fetus willmore than triple.

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The development of the fetus is meticulously recreated throughout the film's feature-length running time.Blood and nourishment are allowed free flow throughout the embryo as the heart begins to develop from a mass of muscle cells after 22 days.

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The process of prenatal development or the period of the formation of an embryo, through the development of a fetus, to birth.

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the development before birth the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth (or parturition).