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Prenatal Development

By Doris Clarence
  • Period: to

    Zygote

    First two weeks
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    First Trimester

    week 1 through week 12
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    Embryo

    Week 3-8
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    Fetus

    9th week - birth
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    2nd Trimester

    week 13 to week 27

  • Week of detection

    18-20 weeks

  • week of Viable Birth

    23 weeks
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    Third trimester

    week 28 to the birth

  • Full Term Pregnancy

    39 weeks

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