Stages of Pregnancy Pictures Slideshow: See the 1st, 2nd and 3rd Trimesters of Mom & Baby

Medical- Medicine

First Trimester: The Baby at 4 Weeks

  • Your baby’s brain and spinal cord have begun to form.
  • The heart begins to form.
  • Arm and leg buds appear.
  • Your baby is now an embryo and 1/25 of an inch long.
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