One week to your due date. Your baby at 39 weeks is considered "full term" in the truest sense — all organ systems are mature, and the risk profile of birth now matches what used to be called a "normal" delivery. Waiting from here until labor begins naturally is the recommended approach for uncomplicated pregnancies, because the final days still deliver meaningful gains. But you're ready. Your baby is ready. It's just a matter of when.
Track your progress with our Due Date Calculator.
Your Baby This Week
Size: Mini watermelon — about 50.7 cm (head to toe)
Weight: About 3.3 kilograms
All organs are mature. Here's what the final development looks like:
- All organ systems are complete. Lungs, kidneys, liver, brain, heart, digestive system — every system is functioning and ready for life outside the uterus. This is what makes 39–40 weeks the optimal window for delivery.
- Brain is still growing. Even with all organs mature, the brain continues to grow and develop — this doesn't stop at birth or even in childhood. But within pregnancy, weeks 39 and 40 are when brain maturation is most complete. The difference in cognitive outcomes between 37-week and 39-week births is statistically meaningful.
- Immune system is well supplied. Antibody transfer from you to your baby through the placenta has been ongoing for weeks and peaks at full term. Breastfeeding will continue to provide antibodies postpartum, particularly through colostrum.
- Vernix is sparse. Most of the waxy coating has been absorbed or shed into the amniotic fluid. You may see small amounts in skin folds at birth.
- Baby is running out of room. At 3.3 kg and 50+ cm, your baby is genuinely large relative to the available space. Movements are strong but feel different — rolling, grinding, shifting rather than kicking freely.
- Fat stores are complete. Your baby has enough fat to regulate body temperature and sustain energy in the first hours and days after birth.
Your Body This Week
You are carrying a full-term baby and likely feeling every bit of it:
- Intense pelvic pressure. The baby's head is deep in your pelvis. Walking may be difficult. You may feel sharp cervical pressure with movement, sometimes called "lightning crotch."
- Frequent urination. With a baby's head pressing directly on your bladder, urgency is constant. This is normal and resolves immediately after birth.
- Cervical changes. Your cervix is continuing to efface and dilate. Some women are 3–4 cm dilated at 39 weeks and don't go into labor for another week. Dilation is useful information but not a reliable timeline.
- Prodromal labor. Many women experience irregular, intense contractions in the days before active labor — sometimes for hours. This is often called "practice labor" and it's real, exhausting, and does represent cervical work, even if it's not progressive active labor yet.
- Colostrum. If you're breastfeeding, your breasts are ready. Colostrum — the first milk, thick and concentrated — is present and will be your baby's first food. It's packed with antibodies and nutrients and is perfectly calibrated for a newborn's tiny stomach.
- Emotional state. You're done waiting, you're exhausted, and you're scared. All of that is valid. The anticipation at 39 weeks is its own kind of intensity.
Tips for Week 39
1. You don't need to do anything to "induce" labor naturally. Walking, spicy food, pineapple, castor oil, acupuncture — none of these have reliable evidence behind them, and some (castor oil in particular) carry real risks. Your body and baby will initiate labor when the hormonal cascade is ready. Trust the process.
2. Stay hydrated. Dehydration can trigger Braxton Hicks contractions and make it harder to distinguish them from real labor. Drink water consistently throughout the day.
3. Know your birth plan inside out. Your birth partner should know it as well as you do. In active labor, you will not be the best advocate for yourself — they need to be able to speak for you.
4. Have your support team on standby. Make sure the people who need to be reachable are reachable — your birth partner, whoever is watching older children or pets, whoever is picking up the postpartum support shift.
5. Let yourself sleep whenever possible. Labor ahead will require enormous energy. If you can sleep, sleep. If you're up at 3am with prodromal contractions, try a warm bath or shower, change position, and see if they progress or stop.
6. Put your phone down sometimes. The combination of anxious waiting and constant notification checking is not good for your mental state. Set boundaries around who you tell you're in labor and when.
When to Call Your Doctor
- Water breaking — always go in; even without contractions, ruptured membranes require evaluation
- Contractions 5 minutes apart, 1 minute long, for 1 hour — the 5-1-1 rule for first-time mothers; confirm your provider's specific guidance
- Heavy vaginal bleeding — this is not bloody show
- Decreased fetal movement — your baby should still move actively at 39 weeks; fewer than 10 movements in 2 hours requires a call
- Signs of preeclampsia: severe persistent headache, visual disturbances, upper right abdominal pain, sudden swelling
- Fever, chills, or any feeling that something is wrong — call
Related Tools & Articles
- Due Date Calculator — Calculate your estimated due date
- Contraction Timer — time those contractions
- Hospital Bag Checklist — full packing list
- Pregnancy Week 40 — due date week
- Pregnancy Week-by-Week Overview — full timeline