What to Expect: Third Trimester (Weeks 27 to 40)

Steps
Symptoms

You may experience:

  • Back pain and discomfort as your belly grows.
  • Shortness of breath from your baby pressing on your lungs, making it harder to take deep breaths.
  • Swelling in your feet, ankles, and hands due to extra fluid and pressure on your veins.
  • Frequent urination from your baby pressing on your bladder.
  • Trouble sleeping as it becomes harder to find a comfortable position.
  • Braxton Hicks contractions.  These “practice” contractions feel like your belly is tightening but aren't as painful as labor contractions.
  • Leaking breasts as you start to produce colostrum, the first form of milk.
Medical Exams & Tests

You'll have more frequent prenatal visits (every 2 to 3 weeks, then weekly after 36 weeks) as your provider continues to monitor:

  • Your weight
  • Your blood pressure
  • Your baby's growth

You may also have:

  • A group B strep test (35 to 37 weeks).  This swab test checks for a common bacteria that could affect your baby during delivery.
  • A fetal position check to see if your baby is head down, preparing for birth.
  • Vaccines to protect your and your baby's health.  These vary by time of year but can include Tdap, flu, COVID, and RSV.
Your Baby's Development

Weeks 28 to 32:

Your baby's brain is developing rapidly, and they can now blink their eyes.  Your baby is about the size of a large eggplant.

Weeks 33 to 36:

Your baby is gaining weight quickly and practicing breathing.  Their bones are also hardening.  By now your baby is about the size of a pineapple.

Weeks 37 to 40:

Your baby has fully developed lungs and is considered term at 37 weeks.  They're about the size of a watermelon and are preparing for birth.

In the third trimester, you'll feel your baby growing and getting ready for birth, while you prepare with more frequent visits and additional tests.

Technology behind a better experience.

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