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5th Week of Pregnancy

The Tip of a Pen

Baby Development at 5 Weeks Pregnant

Your baby's heart begins to beat and might be visible on an ultrasound.

 
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Baby's Growth and Development at 5 Weeks Pregnant

After weeks of rapid cell development, your baby takes on a more distinct form. During the fifth week of pregnancy, here's what's happening inside:

  • Her heart and circulatory system take shape — a bulge indicates where your baby's heart is developing. By the end of the 5th week of pregnancy, your baby's earliest blood vessels form.
  • Around the 5th week of pregnancy, your baby's heart begins to beat and may be visible on an ultrasound.
  • The umbilical cord replaces the yolk sac. The umbilical cord works with the placenta to bring nutrition and oxygen to your baby and remove waste.
  • At 5 weeks pregnant, your baby is the length of the tip of a pen, about 1/17 inches, and growing rapidly every day.
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