You’ve arrived – the third trimester! The final chapter. The final stretch.
It’s no longer the momentous door you’ve been waiting for for 9 months. But these final weeks don’t wait — baby is still growing fast, your body is getting ready for delivery, and you need to prepare too!
This trimester is exciting, overwhelming, and sometimes nerve-wracking. Today I’ll give you a complete guide from week 27 to week 40 – baby’s development, mom’s symptoms, and preparation for birth.
Third Quarter Review
Duration: Week 27 to Week 40 (Yaham Ke Bad)
What time is it happening:
- The baby is increasing in size dramatically.
- The butterflies are maturing.
- The baby is taking its final position in the womb.
- The mother’s body is preparing for labor.
- The doctor comes again and again.
Week 27-28 — Third trimester begins!
The baby is now about the size of an eggplant!
Child development
- Baby now goes into REM sleep – dreaming!
- Brain waves can be detected – almost like newborns
- The baby’s eyelids may open and close.
- The baby weighs about 900 grams – and will now grow rapidly.
Mother’s symptoms
Increased back pain: Uterus is growing — center of gravity is shifting — lower back pain is common.
Frequent urination: Baby is putting pressure on bladder — bathroom trips are increasing again!
Shortness of breath: Uterus is putting pressure on lungs — can make it difficult to breathe straight.
Insomnia: Difficulty falling asleep, frequent urination, restlessness.
Kick counting: Monitor baby’s movements daily from week 28.
Weeks 29-30 — Baby is gaining weight fast!
The baby is now almost the size of a butternut squash!
Child development
- Baby is gaining about 200 grams each week.
- The brain is growing rapidly – is it becoming a fold or a crease?
- The bones are fully formed – but still soft (for delivery).
- The baby’s skin has turned pink – due to the fat layers.
Mother’s symptoms
Heartburn: Baby is putting pressure on the stomach – acid reflux may be worse.
Swelling (edema): Ankles, feet, hands – minor swelling. But sudden severe swelling – call the doctor!
Braxton Hicks more frequent: Contractions are now more felt – irregular but noticeable.
Hemorrhoids: Can be worse from pressure – fiber and hydration help.
Weeks 31-32 — Baby’s senses fully active!
The baby is now about the size of a coconut!
Child development
- All five senses of the baby are active!
- The child practices breathing for 40 minutes.
- Pfeiffer is almost mature — a baby delivered at week 32 has a high survival rate.
- The baby’s position usually starts with the head down.
Mother’s symptoms
Nesting Instinct:
Suddenly, many moms are busy cleaning the house, organizing things, perfecting the nursery — it’s “nesting” — totally normal!
Pelvic Pressure: Baby is moving down — you may feel pressure in the pelvic area.
Colostrum Leakage: Some moms may leak a little colostrum from their nipples — a normal sign that the body is getting ready to breastfeed.
Week 33-34 — Baby is taking final position!
The baby is now about the size of a pineapple!
Child development
- The baby’s skull is still soft and flexible – for delivery.
- The immune system is developing – transfer of antibodies from the mother
- The baby’s nails will grow to the fingers.
- The baby usually comes into a head-down position by the time
What if the baby is not head down?
If the baby is not head down by 36 weeks – the doctor will discuss some options:
ECV (External Cephalic Version): The doctor tries to manually turn the baby from the breech position – successful in about 50% of cases
Breech delivery: Some doctors/hospitals perform a vaginal delivery – but in most cases a C-section is considered
Mother’s symptoms
Baby Dropping: Around weeks 33-36 – especially in first-time mothers – the baby “drops” into the pelvis. It becomes a little easier to suckle, but pelvic pressure is increased.
Pubic bone pain: Pain in the pubic area as the baby drops – can make walking difficult.
Weeks 35-36 – Almost full term!
Baby is now about the size of a honeydew melon!
Child development
- The baby’s lanugo (fine body hair) is disappearing.
- The vernix (white protective coating) is also decreasing.
- Baby is storing meconium (first potty).
- The baby’s lungs are almost fully mature.
Mother’s symptoms
Group B Strep (GBS) test: This test is done at 35-37 weeks – vaginal and rectal swab. If positive – antibiotics are given in labor.
Carpal tunnel worsens: numbness and tingling in the wrists – due to fluid retention.
Difficulty sleeping: fatigue at rest, frequent urination, restlessness.
Pelvic pain: relaxin hormone is loosening the joints – may cause pelvic pain.
Week 37 – Full term!
Congratulations — your baby is now full term! 🎉
Child development
- The organs are fully mature.
- The baby is preparing to breathe.
- The grip is so strong that it can hold your finger after birth.
- Baby is storing antibodies to protect against infection
Maternal symptoms
Cervical dilation: The doctor will check the cervix at each visit — delivery will be from 0 to 10 centimeters dilated.
Mucus plug: Pink or bloody discharge — a sign of labor that can occur in the weeks following delivery.
Increased Braxton Hicks: More frequent practice contractions — the body is preparing for labor.
Week 38-39 — Any day now!
Baby is now flying herself in at the last minute for delivery.
Child development
- The final connections between the brain and nervous system are being made.
- The baby’s skin is pink, smooth, and plump
- The baby’s position is usually closed — in the pelvic bones.
- The baby is storing antibodies that will protect for months after birth.
Mother’s symptoms
Extreme fatigue: Fatigue may be severe in the last week — the body is conserving energy.
Anxiety and excitement: Both feelings at the same time — completely normal!
Frequent doctor visits: Weekly checkups — cervical dilation, baby’s position, fluid levels.
Week 40 – Due date!
Due date is here — but it’s not a guarantee that the baby will arrive on that exact day!
Fact: About 5% of babies are born on their exact due date!
Post-term: Not technically considered “term” until week 42. Will discuss doctor involvement at weeks 41-42.
Signs of Labor – When to Go to the Hospital?
This is the most important information!
Signs of real labor
Regular contractions: Follow the 5-1-1 rule:
- Contractions every 5 minutes
- Heart contractions 1 minute long
- This pattern has been going on for 1 hour.
Water breaking: Amniotic sac ruptures—gush or slow leak—hospital immediately!
Bloody show: mucus plug discharge — pink or bloody discharge — during labor hours or during the day.
Persistent pain in the lower back that gets worse with contractions — this could also be true labor.
Braxton Hicks vs. Real Labor
| Sign | Braxton Hicks | Real Labor |
|---|---|---|
| Pattern | Irregular | Regular, closer |
| Intensity | That same freedom | More over time |
| Position change | Better warm. | Doesn’t stop. |
| Walking | Better warm. | Could be worse. |
| Duration | Short | Getting longer |
Birth Preparation – Complete Checklist
Hospital bag – what to pack?
For Mom:
✅ ID and insurance documents
✅ Birth plan (if you’ve made one)
✅ Comfortable, loose clothing
✅ Nightgown (front-open for breastfeeding)
✅ Slippers
✅ Toiletries
✅ Phone charger
✅ Snacks
✅ Pillow (your own—the hospital ones are uncomfortable!)
For the Baby: ✅ Onesies (2–3) ✅ Blanket ✅ Car seat — this is a must! The hospital will not discharge you without a car seat. ✅ Mittens (so they don’t scratch themselves with their nails) ✅ Hat
For Your Partner: ✅ Comfortable clothes ✅ Snacks and drinks ✅ Phone charger ✅ Camera
Nursery Checklist
✅ Crib or bassinet ✅ Firm mattress + fitted sheets ✅ Diapers and wipes ✅ Baby clothes (newborn size + 0–3 months) ✅ Baby monitor ✅ Thermometer ✅ Nasal aspirator ✅ Baby bath supplies
Childbirth classes – why are they important?
Childbirth classes are found in:
- What are the stages of labor?
- Breathing techniques
- Pain management options
- In the case of a C-section
- Basics of newborn care
- Breastfeeding Basics
When to join Crane: Around week 28-32
Important tests of the third trimester
Kick counts (daily): Week 28+ GBS test: Week 35-37 Non-stress test (NST): High risk cases in Biophysical profile: fluid levels, fetal movement check Cervical check: Week 36+
When should you call the doctor immediately?
🚨 Immediately:
- Vaginal bleeding
- Water breaking
- Baby’s movement suddenly stops.
- Severe headache
- Vision changes
- Severe pain in the upper abdomen (a sign of preeclampsia)
- Regular contractions before week 37 (premature labor)
- Fever up to 38 degrees Celsius
Quick Reference — Third Trimester Week by Week
| Week | Baby | Mother |
|---|---|---|
| 27-28 | REM sleep, brain waves | Back pain, insomnia, kick counting |
| 29-30 | Weight increases rapidly, the brain grows. | Worsening heartburn, swelling |
| 31-32 | All senses active, breathing practice | Nest, pelvic pressure |
| 33-34 | Head down position, soft scalp | Miscarriage, pain in the navel |
| 35-36 | Phephere mature, lanugo gone | GBS test, carpal tunnel |
| 37 | Full term! All organs ready | Cervical dilation, mucus plug |
| 38-39 | The last connection, antibodies | Extreme fatigue, anxiety |
| 40 | Due date — any day now! | Frequent visits, ready! |
Frequently Asked Questions
Q: How long does it take for a baby to be in a head-down position? Usually by weeks 34-36. If your contractions are still in place after week 36 — talk to your doctor about induction options.
Q: How long can you wait after your due date? Your doctor will monitor your contractions until weeks 41-42. Inductions after week 42 are usually recommended. But every case is different — follow your doctor’s guidance.
Q: When should you go to the hospital? Follow the 5-1-1 rule — contractions 5 minutes apart, 1 minute longer, 1 hour longer. Or your water breaks. Yes, I’m worried — it’s always best to call first.
Q: What is nesting instinct? The sudden urge to organize the house, perfect the nursery – it’s hormonal and psychological preparation for delivery. Absolutely normal!
Q: When is the best time to install a car seat? By weeks 35-36 – practice and make sure it’s installed correctly. You won’t be discharged from the hospital without a car seat!
Last thing
Third Trimester — This final stretch can be anxious, overwhelming, and incredibly exciting. Every week the baby grows, every week the delivery gets closer.
And that moment — when it’s all over and the baby is in your arms — makes it all worth it. Every backache, every sleepless night, every uncomfortable trip to the bathroom.
You’re on the final leg of your 9-month journey. And each one — every second — is the beginning of a new chapter.
At Little Heartbeat, we celebrate your journey of being a little one — from day one to day one. 🌸
What was the hardest or most beautiful moment of the third trimester? Let us know in the comments! And follow us on TikTok!
This article is for educational purposes only. Always consult your doctor for any symptoms or concerns you may have — especially during the third trimester.
