Fetal development week by week

From conception to labor, your baby is constantly growing and developing. Your baby moves through different stages, starting as a blastocyst, then maturing into an embryo, and then a fetus. Around the 5 week mark, your baby’s heart will begin to beat, at 27 weeks they’ll have regular sleep and wake cycles, and at 39 weeks your baby is physically developed. Use this timeline to learn how big your baby is, plus how they’re developing throughout pregnancy.

  • 2 weeks: Fertilization

    an illustration of spermatozoa approaching the egg
  • 3 weeks: Implantation

    illustration of third week pregnancy implantantion
  • 4 weeks

    illustration of the early stage embryo
  • 5 weeks

    illustration of an embryo
    • 6 weeks

      illustration of an embryo
    • 7 weeks

      embryo
    • 8 weeks

      embryo
    • 9 weeks

      embryo with his head down
    • 10 weeks

      illustration of a fetus in a womb

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