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Prenatal development refers to the process in which a baby develops from a single cell after conception into an embryo and later a fetus.The average length of time for prenatal development to complete is 38 weeks from the date of conception. During this time, a single-celled zygote develops in a series of stages into a full-term baby. The three primary stages of prenatal development are the germinal stage, the embryonic stage, and the fetal stage.

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Prenatal or antenatal development is the process in which a human embryo and laterfetus (or foetus) develops during pregnancy, from fertilization until birth. Often, the termsfetal development, or embryology are used in a similar sense.

After fertilization, the process ofembryogenesis (the early stages of prenatal development) begins. By the end of the tenth week of gestational age the embryo has acquired its basic form and the next period is that of fetal development where the organs become fully developed. This fetal period is described both topically (by organ) and chronologically (by time) with major occurrences being listed by gestational age.
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