Pregnancy
39 Weeks Pregnant
At 39 weeks, your baby is the size of a mini watermelon and officially full term. Learn about labor signs, water breaking, and final preparations.
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This article is for general information and is not a substitute for professional medical advice. Always consult your pediatrician or doctor about your child.
Sources: WHO, CDC, AAP and NHS guidance. Recommendations differ between countries — for local advice see the NHS or ACOG.
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At a Glance: Week 39
- Trimester: Third trimester — officially full term
- Baby's size: About the size of a mini watermelon or a pumpkin
- Length: Approximately 50–51 cm (about 20 inches), crown to heel
- Weight: Around 3,200–3,300 grams (about 7.2 pounds)
Congratulations — you've reached full term. From 39 weeks 0 days through 40 weeks 6 days, your baby is in the optimal birthing window. All organ systems are mature, and your baby could be born any day now with the lowest possible risk profile.
Your Baby's Development This Week
Most major development is complete. Week 39 is largely about final refinements:
- Lungs: Fully mature. Surfactant levels are sufficient for independent breathing. The chest will compress during a vaginal birth, helping clear amniotic fluid from the lungs.
- Brain: Continues to grow rapidly — about 30% larger now than at 35 weeks. Connections between neurons are forming at extraordinary speed, a process that will continue for years after birth.
- Skin: No longer translucent. Most vernix has been shed, though some may still be present in the armpits, groin, and skin folds at birth.
- Hair and nails: Fingernails may extend past the fingertips. Some babies are born with a full head of hair; others with little or none — both are normal.
- Reflexes: Sucking, swallowing, rooting, gripping, startle (Moro), and step reflexes are all fully developed and will be checked in the newborn exam.
- Immune system: Antibodies (IgG) from you continue to cross the placenta, providing protection against many infections for the first weeks of life.
- Position: Almost all babies are head-down. The head may now be deeply engaged in the pelvis ("zero station" or lower).
Your Body and Symptoms This Week
By 39 weeks, most people feel ready to be done with pregnancy. Common symptoms include:
- Strong, frequent Braxton Hicks: Sometimes difficult to distinguish from early labor.
- Increased cervical changes: Effacement and possibly dilation. You may notice more mucus discharge and bloody show.
- Persistent pelvic pressure: The baby is deep in the pelvis, pressing on the bladder, rectum, and pelvic nerves.
- Frequent urination: At its peak as the baby's head presses directly on the bladder.
- Back pain: Pelvic ligaments are loose, the baby is heavy, and posture is altered.
- Heartburn and indigestion: May actually improve as the baby drops lower.
- Difficulty sleeping: Discomfort, frequent urination, and anticipation all interfere.
- Edema: Swelling continues. Watch for sudden severe swelling.
- Insomnia and vivid dreams: Hormonal shifts and anxiety.
- Restlessness and mood swings: Late pregnancy is emotionally intense.
- Cervical "ripening": You may not feel this directly, but your provider may note changes at your visit.
Nutrition: What to Eat & Avoid This Week
Nutrition in week 39 focuses on maintaining energy, supporting labor stamina, and building reserves for postpartum recovery and lactation.
- Complex carbohydrates: Oats, whole-grain bread, sweet potatoes, brown rice. Labor is physically demanding — well-fueled bodies handle it better.
- Protein: Eggs, lean meats, beans, Greek yogurt. Supports tissue repair after birth.
- Iron: Building blood-volume reserves. Lean red meat, lentils, fortified cereals.
- Hydration: Continue 2.5–3 liters daily. Dehydration can mimic or worsen contractions.
- Dates: Continued evidence suggests 6 dates per day in the final weeks may shorten labor and reduce induction need.
- Easy snacks: Stock things you can grab one-handed for the postpartum period — nuts, granola bars, fresh fruit, hard-boiled eggs.
Avoid: alcohol, high-mercury fish, unpasteurized dairy, raw/undercooked animal products, and excessive caffeine. Many providers also recommend a lighter, easier-to-digest dinner in late pregnancy in case labor begins overnight.
Movement & Exercise
Gentle, regular movement supports labor preparation and overall wellbeing:
- Walking: One of the most effective ways to encourage labor when your body is ready. Aim for 20–30 minutes if comfortable.
- Pelvic tilts and cat-cow: Relieve back pain, help baby positioning.
- Supported squats: Open the pelvis and prepare muscles for pushing.
- Birth ball: Sitting upright and circling hips on a birthing ball encourages optimal fetal positioning.
- Stretching: Gentle hip openers, hamstring stretches, and shoulder rolls relieve tension.
- Swimming: Wonderful for swelling and joint relief.
Avoid: anything strenuous, exercises with fall risk, prolonged lying on the back, and overheating. If something doesn't feel right, stop. Listen to your body — it's wise.
Mental & Emotional Wellbeing
Week 39 is often emotionally heightened. You may feel impatient, anxious about labor, nervous about parenthood, or all of the above simultaneously. These feelings are valid and normal.
- Distract yourself constructively. Watch favorite shows, see friends, take small outings — staring at your belly waiting for contractions only makes time crawl.
- Avoid the "due date countdown" trap. Some people find it helpful to mentally extend their due date by a week or two to reduce disappointment.
- Talk to your partner about postpartum expectations. Division of night feeds, visitor management, family boundaries.
- Visualize a positive birth experience. Mental rehearsal can reduce anxiety on the day.
- Have your mental health team in place. If you have a history of depression or anxiety, ensure you know who to call postpartum.
- Lean on your community. Friends, family, online groups — even a brief conversation reduces isolation.
Common Concerns & When to Call Your Doctor
Call your provider or go to labor and delivery immediately if you experience:
- Decreased fetal movement (fewer than 10 movements in 2 hours during active time)
- Heavy vaginal bleeding
- A gush or steady trickle of fluid (water breaking) — note the color
- Greenish, brownish, or yellow fluid (possible meconium)
- Regular painful contractions, typically 5 minutes apart for an hour
- Severe persistent headache, vision changes, upper abdominal pain (preeclampsia signs)
- Sudden severe swelling, especially face or one leg
- Fever above 100.4°F (38°C)
- Any feeling that "something is wrong" — trust your instincts
Tests & Appointments This Week
Your 39-week visit typically includes:
- Blood pressure, weight, urine screening
- Fundal height and fetal heart rate monitoring
- Discussion of fetal movement and any symptoms
- Possible cervical check (dilation, effacement, station)
- Optional membrane sweep (your provider will discuss with you)
- Discussion of induction options if you're approaching or past your due date
- Final review of when to come to the hospital
If you have specific medical conditions (gestational diabetes, hypertension, IUGR, advanced maternal age), additional monitoring may include non-stress tests (NST) or biophysical profiles (BPP) one or more times per week.
Tips for Week 39
- Keep your phone charged and on you at all times. Have important numbers written down on paper as a backup.
- Eat a light, easily digestible meal at any sign of early labor. Hospitals may restrict eating during active labor, so fuel up early.
- Try to sleep when you can. Naps, early bedtimes, multiple pillows — whatever helps.
- Practice your relaxation tools. Deep breathing, visualization, listening to a calming playlist. Familiarity helps in labor.
- Communicate your needs clearly. Tell your partner, family, and provider what you need — physical help, space, encouragement.
Preparing for What's Next
Labor and the early postpartum days are imminent. Final preparations:
- Postpartum support: Confirm who's helping in the first 2 weeks. Postpartum recovery is real — solo parenting from day one is exhausting.
- Feeding plan: If breastfeeding, identify a lactation consultant in advance and have their number handy. If formula feeding, have formula, bottles, and a sterilizer ready.
- Pediatrician: First visit scheduled (usually 2–5 days after discharge).
- Sleep arrangements: Bassinet or crib set up with firm mattress and no soft bedding (per AAP safe sleep guidelines).
- Postpartum supplies: Pads, peri bottle, witch hazel pads, comfortable underwear, ice packs for perineal care, nipple cream.
- Boundaries: Decide who visits and when, and communicate before baby arrives. Postpartum is not the time for unexpected guests.
- Communication plan: Group text, social media announcement, or just a partner-led update plan to reduce demands on you.
Frequently Asked Questions About Week 39
Am I officially full term at 39 weeks?
Yes. According to ACOG, full term begins at 39 weeks 0 days and continues through 40 weeks 6 days. This is the optimal window for delivery — your baby has completed important final development (brain, lungs, organs), and the risk of complications is at its lowest. If your provider has discussed elective induction or scheduled cesarean, 39 weeks is generally the earliest recommended time unless there are medical reasons to deliver sooner.
How will I know when my water breaks?
For some people, water breaking is a dramatic gush of fluid — but for many it's a slow, persistent trickle that's hard to distinguish from urine. Amniotic fluid is typically clear or slightly cloudy and doesn't have a strong odor. If you notice continuous leaking that you can't stop, call your provider. Note the time, color (clear is normal; green, brown, or yellow may indicate meconium and needs immediate evaluation), and amount. Don't insert anything into the vagina once your water has broken, to reduce infection risk.
What are the most reliable signs labor is starting at 39 weeks?
The most reliable signs are: regular contractions that increase in intensity, duration, and frequency over time; contractions that don't stop when you change position, hydrate, or rest; rupture of membranes (water breaking); and significant bloody show. Less reliable signs include nesting bursts, loose stools, mild back pain, and increased Braxton Hicks. If you're not sure whether you're in labor, time contractions for an hour and call your provider — they expect these calls.
Is it normal to feel disappointed when I haven't gone into labor by 39 weeks?
Completely normal. By 39 weeks, most people are physically uncomfortable, emotionally exhausted, and have been mentally preparing for "any day now" for weeks. Remember that only about 5% of babies arrive on their exact due date, and roughly half are born after 40 weeks. Your due date is an estimate, not a deadline. Try to redirect energy into rest, gentle activity, and self-care rather than counting hours.
What is "stripping the membranes" and should I have it done?
Membrane sweeping (or stripping) is a procedure where your provider inserts a finger through the cervix and gently separates the amniotic sac from the lower uterus. This releases prostaglandins that may help start labor within 24–48 hours. It's typically offered at or after 39–40 weeks. It can be uncomfortable and may cause cramping or spotting. Research shows it modestly reduces the need for formal induction but isn't guaranteed to work. It's a personal choice — discuss benefits and risks with your provider.
Why is the baby's movement different at 39 weeks?
Movement at 39 weeks often feels different because the baby has very little room to move — there's much less amniotic fluid relative to the baby's size. Big sweeping kicks become rolls, squirms, and pokes. However, frequency of movement should not decrease. Continue doing kick counts: 10 distinct movements within 2 hours during baby's typical active time. If you don't feel 10 movements, drink something cold, lie on your left side, and recount. If you still don't feel them, call your provider immediately.
Should I be induced at 39 weeks?
The ARRIVE trial (2018) showed that elective induction at 39 weeks for low-risk first-time mothers slightly reduced cesarean rates and some complications compared to expectant management. However, induction is a longer process and may involve more interventions. ACOG considers elective induction at 39 weeks a reasonable option for low-risk pregnancies, but it's not required. Discuss your specific situation with your provider — your health, baby's health, your preferences, and your hospital's policies all matter.
Is it safe to be sexually active at 39 weeks?
For most low-risk pregnancies, yes — until your water breaks. Semen contains prostaglandins, which can help ripen the cervix, and orgasm causes uterine contractions. There's modest evidence sex may help start labor when your body is ready. Avoid sex if: your water has broken, you have placenta previa, you've had any bleeding, your provider has restricted it, or you have any active infection. Find positions that are comfortable for the size of your belly (side-lying, spooning).
What if I go past 40 weeks?
Going past your due date is normal — about half of first-time pregnancies last beyond 40 weeks. At 41 weeks, your provider will likely begin more frequent monitoring (non-stress tests, biophysical profile) to ensure the placenta is still functioning well. Most providers recommend induction by 41 to 42 weeks because risk of stillbirth and other complications increases beyond that point. Until then, continue normal activity, monitor fetal movement carefully, and try to stay patient.
Should I be timing every contraction at 39 weeks?
Time contractions when they become noticeable, regular, and progressively more intense. The classic guideline is "5-1-1": contractions 5 minutes apart, lasting 1 minute each, for 1 hour straight. At that point, call your provider or head to the hospital. For second or subsequent pregnancies, your provider may suggest coming in sooner (often at 7-1-1 or even earlier) because labor tends to progress faster. A contraction timer app or simple notebook works well.
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