DCSIMG
Text Size Small Text Size Medium Text Size Large TEXT SIZE

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.

 
Hate it!
Dislike it!
Meh...
Like it!
Love it!

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.
NEW! PREGNANCY: WEEK-BY-WEEK GUIDE
Diaper Bag with Similac Products
Are StrongMoms Smarter, or Just More Stylish?
Hard to tell with all the savvy offers, free tips, and advice. Join for perks like:
  • Easy style tips for new moms
  • A community of moms like you (dads, too!)
  • Monthly emails tailored to your pregnancy
  • Up to $329 in offers*
Sign Up

*Offers may vary.
About Similac®
Similac Advance Baby Formula Pack
For more than 80 years, Similac has helped babies grow strong. Explore the Similac family of products.