Week 30
Your baby is the size of a cabbage
At 30 weeks, your baby's bone marrow takes over making red blood cells from the liver and spleen. A quiet handoff that happens around now per Mayo Clinic. Your baby is more than 10 1/2 inches crown-to-rump and nearly 3 pounds. Eyes can open wide. Hair, sometimes a lot of it. And your hands? Possibly waking you up at 3 AM with pins and needles. Here's what week 30 actually is.
Key takeaways
- At 30 weeks your baby is more than 10 1/2 inches crown-to-rump and weighs nearly 3 pounds per Mayo Clinic. Eyes can open wide this week, and a good head of hair is common.
- Red blood cells now form in your baby's bone marrow per Mayo Clinic. The liver and spleen are stepping back from blood-making as bone marrow takes the lead per StatPearls.
- Breech presentation is around 25% at 28 weeks or less and drops to about 7% by 32 weeks per StatPearls. ACOG doesn't formally assess fetal presentation until 36 weeks. Plenty of room to turn.
- Pregnancy-related carpal tunnel is clinically diagnosed in 31% to 62% of pregnancies per Padua et al. (Muscle & Nerve, 2010). Symptoms tend to peak in the late third trimester and usually resolve within weeks after birth.
Your baby's bone marrow takes over red blood cell production this week, and the liver is stepping back
Per Mayo Clinic, at 30 weeks your baby is more than 10 1/2 inches (270 mm) crown-to-rump and weighs nearly 3 pounds (1,300 g).
Eyes can open wide.
A good head of hair is common by this week, though some babies arrive practically bald and grow theirs in later.
The headline shift this week is invisible.
Per Mayo Clinic, red blood cells now form in the bone marrow. Erythropoiesis started in the yolk sac in the first weeks of pregnancy, moved to the liver around week 7, and per StatPearls hands off to the bone marrow as the third trimester progresses. Liver and spleen production winds down.
Bone marrow is the main factory from here.
Where is your baby positioned right now? Probably head-down. Possibly not.
Per StatPearls, breech presentation is around 25% at 28 weeks or less and drops to roughly 7% by 32 weeks. Most babies turn on their own.
ACOG doesn't formally assess presentation until 36 0/7 weeks per the 2020 ECV practice bulletin. If your baby is still breech at term, an external cephalic version is offered around 37 weeks. You have time.
Why your hands fall asleep at 3 AM, and what fluid retention has to do with it
Pins and needles in the thumb, index, and middle finger. Worse at night.
That's carpal tunnel syndrome, and it's a lot more common in pregnancy than most people realize.
Per Padua et al. (Muscle & Nerve, 2010), clinically diagnosed pregnancy-related carpal tunnel syndrome ranges from 31% to 62%. The same systematic review puts neurophysiologically confirmed cases at 7% to 43%. Either way: not rare.
The mechanism is mostly fluid. Third-trimester volume expansion pushes swelling into the wrist's narrow tunnel, which compresses the median nerve. Same fluid story drives the foot-and-ankle swelling you've probably noticed too.
What helps:
- Sleep in a wrist splint that holds the wrist neutral. Worn overnight, it stops the bent-wrist position that triggers symptoms.
- Skip hot showers right before bed. Heat worsens swelling.
- Elevate hands and feet when you can. Lay back on the couch with feet on a pillow for 20 minutes.
- Shake out your hands when symptoms hit. Pour the coffee with the other one.
For most, symptoms resolve within weeks after birth.
Contact your provider right away if you have severe swelling in the face or hands, persistent headache or vision changes, upper-belly pain, regular contractions, fluid leakage, or a sustained drop in your baby's movement.
For dads
Here's your move:
Sign up for the childbirth class this week. Most hospital-based classes fill 4 to 8 weeks out, and the third trimester from here gets harder to schedule, not easier. The standard syllabus covers labor stages, pain management, breathing, and partner support roles. A one-day intensive crams it into 6 to 8 hours if a Saturday is all you have. Schedule the hospital tour at the same time. Walk the route from parking to labor and delivery. Find the cafeteria. Find the visitor coffee. Confirm the elevator works at 3 AM. Operational stuff. The kind you don't want to learn during a contraction.
Real talk:
Her hands fell asleep at 3 AM and she didn't mention it. The carpal tunnel piece is real, half of pregnancies catch it, and the late third trimester is the worst stretch. Same with the swelling. She's been moving slower than she wants to and pretending she isn't, because she's tired of complaining about her body. Order the wrist splints. Order two. Rub her feet for ten minutes when she sits down at night without asking if she wants it. The version of you who keeps showing up with small, specific things is the partner who actually carries her through the next ten weeks.
Common concerns
Is it normal that my baby is still breech at 30 weeks?+
Yes. Per StatPearls, breech presentation is about 25% at 28 weeks or less and drops to roughly 7% by 32 weeks. Most babies turn on their own. ACOG doesn't formally assess fetal presentation until 36 0/7 weeks per its ECV practice bulletin, and an external cephalic version is offered around 37 weeks if your baby is still breech then. There's plenty of time and space for a flip.
My hands keep falling asleep at night. Should I see a specialist?+
Probably not yet. Pregnancy-related carpal tunnel is clinically diagnosed in 31% to 62% of pregnancies per Padua et al. (Muscle & Nerve, 2010) and usually resolves within weeks after birth. A wrist splint worn overnight handles most cases. If pain is severe, fingers feel weak, or splinting doesn't help, talk to your provider.
How much weight should I be gaining each week now?+
Per ACOG, third-trimester weight gain averages about 0.5 to 1 pound per week for a singleton pregnancy if you started with a normal BMI, less if you started overweight, more if underweight. Total recommended gain runs 25 to 35 pounds for normal BMI. Your provider tracks the trend across visits more than any single number.
I'm getting Braxton Hicks contractions several times a day. Is this normal?+
Usually, yes. Braxton Hicks contractions become more noticeable in the third trimester. They're irregular, not progressively closer together, usually painless, and ease with hydration or a position change. Time them for an hour if you're unsure. Regular contractions that get closer together and don't stop with rest are a different call. Contact your provider the same day.
Product picks for week 30
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FEATOL Wrist Brace Hand Brace, Carpal Tunnel Wrist Splint Night Support
Lightweight night-support splint that holds the wrist neutral while you sleep, the position the section recommends.
TheraFlow Foot Roller for Plantar Fasciitis and Reflexology
Wooden foot roller you can use under the desk or on the couch. The cheap, quiet version of the foot-massage the dad section recommends.
MEGCXIT Memory Foam Leg Elevation Pillow
Foam wedge that elevates the legs above the heart, matching the position the section's bullet describes for fluid pooling in the feet.
Sources
- Mayo Clinic, Fetal Development: The 3rd Trimester (March 2025) — https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/fetal-development/art-20045997
- Singh R, Sugumar K. Embryology, Hematopoiesis. StatPearls (May 2025) — https://www.ncbi.nlm.nih.gov/books/NBK544245/
- Gray CJ, Shanahan MM. Breech Presentation. StatPearls (November 2022) — https://www.ncbi.nlm.nih.gov/books/NBK448063/
- ACOG, External Cephalic Version (Practice Bulletin No. 221, May 2020) — https://www.acog.org/clinical/clinical-guidance/practice-bulletin/articles/2020/05/external-cephalic-version
- Padua L et al. Systematic review of pregnancy-related carpal tunnel syndrome. Muscle & Nerve (2010) — https://pubmed.ncbi.nlm.nih.gov/20976778/
A quick note: This content is for informational purposes only and is not a substitute for professional medical advice. Always talk to your healthcare provider about any questions or concerns. Content based on guidance from the American College of Obstetricians and Gynecologists (ACOG), the American Academy of Pediatrics (AAP), Mayo Clinic, and peer-reviewed medical literature. Learn how we create our content.