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STAGE OF FETAL DEVELOPMENT

geomed 1 min read
Not yet medically reviewed. This page has not been checked by a qualified medical reviewer. Use it for general education only and confirm anything important with a healthcare professional. Last updated 2 November 2026.

Reproductive

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  • First Trimester (Weeks 1–12): Major organs begin forming, the heart starts beating, and the brain, spinal cord, arms, and legs develop.

  • Second Trimester (Weeks 13–27): The baby grows rapidly, movements become noticeable, facial features develop, and hearing begins.

  • Third Trimester (Weeks 28–40): The brain and lungs continue maturing, body fat increases, and the baby prepares for birth.