31 Weeks Pregnant
third trimester · Month 8
9 Weeks to Go!
Baby is as long as a coconut
Key Takeaways
- Most babies turn head-down (cephalic) by 31-32 weeks
- Brain connections multiplying rapidly
- Bones hardening (skull stays soft for birth)
31 Weeks Pregnant
Baby’s Development
Your baby has grown to about 41 centimeters — close to the size of a coconut — and weighs approximately 1,500 grams, or about 3.3 pounds [1]. Most babies turn head-down (the cephalic position) by 31 to 32 weeks, settling into the orientation they will likely keep for birth. Inside that growing brain, connections are multiplying rapidly, with billions of synapses forming every day. Your baby’s bones are continuing to harden, though the skull bones stay soft and unfused to allow for compression during the journey through the birth canal. The skin is becoming smoother and pinker, and body fat now makes up about 8 percent of your baby’s weight. The lungs are producing more surfactant, and while movement is still strong, space is getting noticeably tighter. Your baby’s eyes can now focus and track light, and the brain is beginning to take on the job of regulating body temperature, though this skill is still maturing [2].
Pregnancy Symptoms
You are deep in the third trimester now, and the familiar symptoms may be intensifying. Backache, worsening heartburn, constipation, leg cramps, swelling, headaches, and Braxton Hicks contractions are all common at this stage. Your uterus sits about 11 centimeters above your navel, and the kicks you feel are strong — sometimes even visible from the outside. Round ligament pain, sciatica, and pelvic aches can make daily movement more uncomfortable, while heartburn, shortness of breath, and frequent urination continue. You may also notice restless legs, hemorrhoids, or carpal tunnel syndrome. Sleep tends to be difficult, and fatigue is a faithful companion. Leakage of colostrum is common as your breasts prepare for feeding, and you may find that anxiety about labor begins to surface as the weeks draw closer [2].
Body Changes
Your uterus is now about 11 centimeters above your navel, and a weight gain of 23 to 31 pounds by this point is typical. Your bump is large, and you may notice stretch marks, the linea nigra, melasma, more visible veins, and varicose veins. Your breasts may have grown by two or more cup sizes, and colostrum may begin to leak. The “pregnancy mask” (melasma) can appear on your face, and swelling in your feet and ankles is common. Your heart rate may range between 80 and 100 beats per minute, and your shifted center of gravity continues to change how you move through the world [2].
Tips for Week 31
- Monitor fetal position at your next OB visit, where your provider will check whether your baby is head-down. The cephalic (head-down) position is ideal, but a breech (head-up) position is perfectly fine at 31 weeks, since most babies turn on their own by 36 weeks. If your baby is still breech at 36 weeks, options include external cephalic version (ECV), vaginal breech delivery, or a planned C-section.
- Address anxiety about labor by talking to your provider, attending a childbirth class, reading positive birth stories, and considering a doula if it interests you — doulas have been shown to improve outcomes and reduce interventions. Knowledge is one of the best antidotes to fear.
- Strengthen your body for labor with squats, pelvic tilts, Kegels, and glute bridges, all of which help prepare your pelvic floor, hips, and core for delivery.
- Manage swelling by drinking plenty of water, wearing compression socks, elevating your feet, and reducing sodium. If swelling becomes sudden and severe, especially with a headache or vision changes, call your OB right away.
Things To Do (Checklist)
- Check fetal position at your next OB visit
- Address labor anxiety through a class, doula, or your provider
- Continue or begin labor prep exercises like squats and Kegels
- Manage swelling proactively
- Continue kick counting (aim for 10 movements in 2 hours daily)
- Fetal position confirmed; BP/urine check
Frequently Asked Questions
Q: My baby is breech. Can they still turn? A: Yes, they can. About 25 percent of babies are breech at 28 weeks, but that number drops to around 7 percent at 32 weeks and just 3 to 4 percent at term. Most turn on their own, and an external cephalic version (ECV) at 36 to 37 weeks can sometimes manually turn a baby who has not [1].
Q: Should I hire a doula? A: The evidence is supportive: studies link doulas to shorter labor, less pain medication, fewer C-sections, and better APGAR scores for babies. Cost typically ranges from $500 to $2,000 in your area, and insurance sometimes covers part of it. Ultimately, it is your call [2].
Q: I’m leaking fluid. Is it urine or amniotic fluid? A: Amniotic fluid is usually clear, sweet-smelling, and tends to trickle continuously. Urine is yellow, has an ammonia smell, and is somewhat controllable. If you are unsure, call your OB — they can test the fluid using nitrazine paper or ferning patterns to tell the difference [1].
For Dads
- Research doulas if your partner is interested — your area has many DONA-certified options. Interview two or three, and know that the cost (typically $500 to $2,000) can reduce interventions and provide support for both your partner and you. This is ultimately your partner’s choice.
- Have the birth plan conversation together, covering pain management preferences (epidural, nitrous, or natural), preferred positions, who will be present, the environment you want, and immediate postpartum wishes. Being aligned now will help you both feel calm when the day arrives.
- Test the car seat to make sure your infant car seat is rear-facing and properly installed. Many fire stations offer free car seat checks, so take advantage and practice buckling the seat in.
- Read The Expectant Father, Chapter 29, which covers the third trimester, your evolving role, and the decisions ahead.
- Pray for proper positioning — that your baby settles head-down for delivery, a quiet reflection on the body’s remarkable design.
Sources
- ACOG — How Your Fetus Grows During Pregnancy
- Mayo Clinic — 31 Weeks Pregnant
- What to Expect When You’re Expecting — Heidi Murkoff (Chapters 17-18: Third Trimester)
Sources
- guideline ACOG — How Your Fetus Grows During Pregnancy
- medical Mayo Clinic — 31 Weeks Pregnant
- book What to Expect When You're Expecting — Heidi Murkoff
Your Checklist
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Action Plan Items for Week 31
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