Implantation: Week 4 of Pregnancy

  • 24 Oct 2026

Key highlights or summary

  • 36 Weeks to go
  • This week your baby is still called an embryo at this stage, is very tiny, measuring only about 2 millimeters (mm) long. This is roughly the size of a Poppy Seed.

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    2. Kim SM, Kim JS. A review of mechanisms of implantation. Dev Reprod. Dec 2017;21(4):351-59.
    3. Chaabani H. New insights into human early embryo development: a particular theoretical study. International Journal of Modern Anthropology.2018;2(11):14-46.

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