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The Bump Editors

Your Pregnancy: Week 27

Got a sudden pain in your rear? That's just baby, settling into place for his upcoming debut. His head might be pressing on your sciatic nerve, which can cause pain and numbness down the backs of your legs. Don't worry — it'll ease up soon after labor. For now, your aching back deserves a pat. You've reached trimester three!

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TOOL: Fill-in-the-blank birth plan
Nanny vs. Daycare?
Got your third trimester tests scheduled?
See all third trimester Q&As


Baby's now the size of a rutabaga!**
Baby's lungs are going through some major developments these days, which (combined with the opening of previously plugged nostrils) means he's now able to practice inhaling and exhaling. The lack of air in your womb means every "breath" is filled with amniotic fluid, but hey — it's progress.


Prepare a birth plan
Practice labor exercises
> Go to your checklist

[tip]  When traveling — be it by plane, train, or automobile — take a quick stretch and stroll every hour or two to keep the blood flowing through you and baby.

Chat with other moms-to-be who share your due date

Read more about being 27 weeks pregnant

All medical information reviewed by Dr. Geeta K. Swamy, Duke University Medical Center OB/GYN Department