Prenatal Development Timeline

By FACSHahn

  • Start of First Trimester

  • Period: to

    Period of the Zygote

  • Period: to

    Period of the Embryo

  • Period: to

    Period of the Fetus

  • Start of Second Trimester

  • Week of sex detection- Week 18

  • Week of viable birth- 24 weeks

  • Start of Third Trimester

  • Full term pregnancy- 40 weeks

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