Week 36 of Pregnancy
Learn about your baby's development and what to expect at 36 weeks pregnant.
Baby's Size This Week
Baby Development at Week 36
- ● At week 36, your baby is about 47.4 cm long and weighs around 2622g.
- ● The lungs are nearly fully mature — surfactant production is well-established, and babies born at 36 weeks rarely require respiratory support.
- ● Your baby is getting into position for birth with the head firmly in the pelvis in most cases, and the skull plates remain flexible for molding during delivery.
- ● The immune system is receiving its final major transfer of maternal antibodies across the placenta.
- ● Lanugo (the fine body hair) has almost completely disappeared, and the vernix caseosa (the white protective coating on the skin) is thinning.
- ● Your baby is practicing swallowing, blinking, and sucking reflexes in preparation for life outside the womb — each practice movement strengthens these vital reflexes.
Your Body at Week 36
- ● As week 36 approaches, you may notice increased pelvic pressure and a feeling that the baby has dropped lower in the pelvis (lightening).
- ● Nesting instincts often kick in strongly — a strong urge to clean and organize in preparation for baby's arrival.
- ● Cervical changes may begin or accelerate; your doctor or midwife will monitor effacement and dilation at weekly prenatal visits starting this week.
- ● Braxton Hicks contractions are intensifying and becoming harder to differentiate from early labor — note the timing and contact your provider if they become regular or painful.
- ● Frequent urination increases as the baby's head descends and puts direct pressure on the bladder.
- ● You may feel sharp, shooting pains down your inner thighs or groin (called lightning crotch) — caused by the baby pressing on pelvic nerves.
Week 36 Checklist
- ☐ Attend weekly prenatal appointments that begin at 36 weeks — your provider will check cervical progress and baby's position.
- ☐ Complete the GBS swab test (vaginal and rectal) if not yet done — this is typically performed between 35–37 weeks.
- ☐ Confirm your hospital route and parking, and pre-register if your facility requires it — know the fastest route at different times of day.
- ☐ Review newborn care basics including safe sleep practices (firm flat surface, back to sleep, no loose bedding), feeding, and bathing.
- ☐ Confirm your chosen pediatrician and verify that they can see your newborn within 3–5 days of discharge.
- ☐ Ensure your maternity leave paperwork is submitted and your partner's or support person's leave plans are confirmed.
Frequently Asked Questions
What should I expect at 36 weeks pregnant?
At 36 weeks pregnant, you are in the third trimester and entering the late preterm period. Your baby is about the size of a Romaine lettuce (47.4 cm) and has nearly mature lungs and established reflexes. Weekly prenatal visits begin this week, and GBS testing is completed. Common symptoms include pelvic pressure, lightning crotch, Braxton Hicks contractions, frequent urination, and nesting. Always consult your healthcare provider for personalized guidance.
How big is my baby at 36 weeks?
At week 36, your baby is approximately 47.4 cm in length and weighs around 2622g — roughly the size of a Romaine lettuce. These measurements are averages based on WHO fetal growth charts; individual babies vary naturally in size.
What is lightning crotch and is it normal at 36 weeks?
Lightning crotch refers to sudden, sharp, electric-shock-like pains in the vagina, rectum, or inner thighs. It is caused by the baby's head pressing on pelvic floor nerves (particularly the pudendal nerve) as it descends into the pelvis. It is a normal, if startling, symptom in late pregnancy. It does not indicate labor, but it does signal that the baby is moving into a lower position in preparation for birth.
What happens at 36-week prenatal visits?
Starting at 36 weeks, prenatal visits shift to weekly. Your provider will check your blood pressure, weight, and baby's heartbeat, measure fundal height, assess the baby's position (vertex vs. breech), and may begin checking your cervix for effacement (thinning) and dilation (opening). Your GBS swab test (if not done at 35 weeks) will be completed at this visit. This is also a good time to confirm your birth plan and finalize labor and delivery logistics.
Can I still give birth vaginally if my baby is breech at 36 weeks?
If your baby is still in a breech (feet-first) position at 36 weeks, your provider may recommend an external cephalic version (ECV) — a procedure where a doctor applies pressure to the outside of your abdomen to manually turn the baby. ECV is most effective between weeks 36–37 and has a success rate of approximately 50–60%. If ECV is unsuccessful or not appropriate, a planned cesarean section is typically recommended.
Track Your Exact Pregnancy Week
Use our free Pregnancy Week Tracker to find out exactly how far along you are based on your last menstrual period or due date.
Track My Pregnancy →Sources
- ACOG
- WHO Fetal Growth Charts
- Mayo Clinic
Medical disclaimer: This content is for informational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider for guidance specific to your pregnancy.