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Start of the period of the zygote
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Start of the first trimester
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End of the period of the zygote
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Start of the period of the embryo
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End of the period of the embryo
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Start of the period of the Fetus
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Start of the second trimester
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Week of sex detection
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Week of Viable birth
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Start of the third trimester
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End of the period of the fetus
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Full term pregnancy