By week 37, you are in the final stretch of pregnancy. Your baby is considered early term and could arrive soon, yet each additional day in the uterus still supports valuable growth and development. This guide explains what is happening with your baby, what you might feel, and how to prepare for labor and the first days after birth.
What “37 Weeks” Means for Your Pregnancy
Pregnancy used to treat 37–42 weeks as one single “full-term” period. Now experts use more specific definitions because research shows that outcomes differ even between these weeks.
| Gestational age | Term category | General notes |
|---|---|---|
| 37 weeks 0 days to 38 weeks 6 days | Early term | Baby looks full-term but lungs and brain are still maturing. |
| 39 weeks 0 days to 40 weeks 6 days | Full term | Best outcomes on average for most uncomplicated pregnancies. |
| 41 weeks 0 days to 41 weeks 6 days | Late term | Usually safe with monitoring; induction may be discussed. |
At 37 weeks, many babies can breathe and feed on their own after birth, but some are more likely to need extra support than babies born at 39–40 weeks.
Your Baby’s Growth and Development This Week
Although your baby may feel big and strong, important changes are still taking place during week 37.
Size, weight, and physical features
- Length is usually around 18–19 inches (about 46–48 cm).
- Average weight is about 6–7 pounds (2.7–3.2 kg), with some healthy babies weighing more or less.
- Your baby continues to add body fat, which helps with temperature control after birth.
- Facial expressions such as frowning or smiling are becoming more obvious, though they are reflexive, not emotional.
- Fine details like toenails now reach the ends of the toes by this stage.
Organ systems in the final weeks
- Brain and nervous system: The brain develops rapidly in late pregnancy; each additional week supports better long-term outcomes for learning and behavior.
- Lungs: By 37 weeks most babies can breathe, but full maturity often occurs closer to 39 weeks, which lowers the risk of breathing problems after birth.
- Digestive system: The gut continues to practice swallowing amniotic fluid, preparing for feeding on breast milk or formula.
- Immune system: Your baby still receives antibodies through the placenta, helping protect against infections in the first months of life.
Baby’s position for birth
By week 37, most babies are in a head-down position, and many have dropped lower into the pelvis, especially in a first pregnancy.
- When the head settles into the pelvis, some people notice easier breathing but more pelvic pressure.
- If the baby is still breech (bottom or feet first), your care team may discuss options such as an external cephalic version (ECV), where a clinician gently tries to turn the baby from the outside.
How Your Body May Feel at 37 Weeks
As your body prepares for labor, you may notice new sensations or changes in symptoms.
Common physical changes
- Practice contractions: Braxton Hicks contractions may become more frequent and stronger. They are usually irregular and may ease with rest or hydration.
- Pelvic and back discomfort: The baby’s head pressing on your pelvis can cause pressure, lower back aches, and a “heavy” feeling.
- Shortness of breath: This may actually improve a bit if the baby drops lower, but the uterus is still large and can limit lung expansion.
- Frequent urination: Increased pressure on the bladder can make bathroom visits even more frequent.
- Sleep problems: Discomfort, heartburn, and frequent urination can make sleep more difficult.
Changes in the cervix and vaginal discharge
- Your cervix may slowly begin to dilate (open) and efface (thin), though this happens at different times for everyone.
- You might notice the mucus plug coming out as a thick or stringy discharge, sometimes tinted with blood; this can be a sign that your cervix is changing, but labor could still be days or weeks away.
- Increased normal discharge is common; however, sudden watery fluid may suggest your water has broken and should prompt a call to your provider.
Early Term vs. Full Term: Why Timing Matters
Although 37 weeks is considered early term and many babies do well, research shows that babies born at 39–40 weeks tend to have fewer breathing difficulties, feeding issues, and NICU admissions compared with those born earlier without a medical reason.
Potential challenges for babies born at 37 weeks
Some babies born in week 37 may look as robust as full-term babies but are more likely to experience certain short-term issues after birth.
- Higher chance of breathing problems such as transient tachypnea of the newborn or mild respiratory distress.
- More frequent difficulties with breastfeeding, including latching problems and trouble coordinating sucking and swallowing.
- Greater risk of jaundice and low blood sugar, which may require closer monitoring or treatment.
- Higher likelihood of needing support in a newborn or intensive care unit compared with babies born at 39–40 weeks.
Because of these risks, many professional organizations recommend avoiding elective deliveries (inductions or planned cesarean sections) before 39 weeks unless there is a clear medical reason for mother or baby.
Warning Symptoms at 37 Weeks You Should Not Ignore
Some symptoms in late pregnancy require urgent medical attention. Contact your healthcare provider or emergency services if you notice:
- Significant vaginal bleeding (more than light spotting).
- Sudden gush or continuous leaking of clear fluid from the vagina (possible rupture of membranes).
- Severe, sudden headaches, vision changes (blurring, flashing lights), or pain high in the abdomen, which can be signs of preeclampsia.
- Marked swelling of the face, hands, or around the eyes, especially if sudden.
- Decreased or absent fetal movements compared with your baby’s usual pattern.
- Burning, fever, or strong pain that seems unusual for you.
If something feels wrong, it is always appropriate to call your provider or local triage line. They can help you decide whether you need immediate care.
Recognizing Labor at 37 Weeks
It can be hard to tell whether you are feeling practice contractions or true labor, especially in a first pregnancy. Paying attention to patterns can help.
Braxton Hicks vs. true labor contractions
| Feature | Braxton Hicks (practice) | True labor |
|---|---|---|
| Timing | Irregular, unpredictable, may be far apart | Become regular, closer together, and more intense over time |
| Intensity | Often mild, may stop on their own | Progressively stronger and harder to talk through |
| Effect of rest | Often ease with rest, hydration, or changing position | Continue despite rest or position changes |
| Cervical change | Do not usually cause dilation or effacement | Gradually open and thin the cervix, leading to birth |
Other signs that labor may be near
- Regular contractions that get longer, stronger, and closer together.
- Bloody show: A mucus-like discharge tinged with blood as the cervix changes.
- Rupture of membranes: A sudden gush or steady trickle of fluid from the vagina.
Your provider will give specific guidance about when to go to the hospital or birth center. Common instructions include going in if contractions are a certain number of minutes apart for at least an hour, or immediately if your water breaks, especially if the fluid is green or brown.
Practical Preparation for Birth at 37 Weeks
Week 37 is a good time to finish practical tasks so you can focus on labor and bonding with your baby when the time comes.
Checklist for this week
- Finalize your birth plan: Note your preferences for pain relief, support people, newborn procedures, and feeding, understanding that plans may change based on medical needs.
- Pack a hospital or birth center bag:
- Comfortable clothes, toiletries, and any medications you take.
- Phone charger and important documents (ID, insurance card, birth plan).
- Clothes, diapers, and a blanket for the baby.
- Prepare the home: Set up a safe sleeping space (a flat, firm surface such as a crib or bassinet) and a place for diaper changes.
- Install the car seat: Practice buckling and adjusting it; many communities offer car seat safety checks.
- Line up support: Arrange help with meals, chores, or caring for older children during and after the birth.
Taking care of your emotional health
Mixed emotions—excitement, anxiety, impatience—are normal at this point.
- Talk openly with your partner, family, or friends about your hopes and worries.
- Ask your provider questions about the birth process, pain management options, and what to expect immediately after delivery.
- Practice relaxation techniques such as slow breathing, guided imagery, or gentle stretching, if your provider agrees it is safe.
Looking Ahead: Baby’s First Days After a 37-Week Birth
If your baby arrives this week, the healthcare team will pay close attention to a few areas.
Breathing and temperature
- Staff will monitor your baby’s breathing rate, color, and oxygen levels shortly after birth, especially if your baby was born by cesarean or had any distress during labor.
- Because early term babies can lose heat more easily, they may be kept skin-to-skin on your chest or under a warmer to maintain a safe temperature.
Feeding and weight
- Many babies born at 37 weeks breastfeed well, but some may be sleepier or tire quickly and need extra encouragement and frequent feeds.
- Care teams may check blood sugar levels, particularly if feeding is slow to start or if your baby is smaller than expected.
Jaundice and follow-up
- Early term babies can be more prone to jaundice (yellowing of the skin and eyes). Your baby will be screened before discharge and may need follow-up checks.
- Early pediatric or midwife visits are especially important if your baby was born at 37 weeks, to be sure weight gain and feeding are on track.
Frequently Asked Questions (FAQs)
Q: Is my baby fully developed at 37 weeks?
A: By 37 weeks, most organ systems can function outside the womb, but the brain and lungs continue to mature through at least 39 weeks. Babies born at 39–40 weeks have lower average risks of breathing problems, feeding difficulties, and NICU stays compared with babies born earlier without medical need.
Q: Is it safe to schedule an induction or cesarean at 37 weeks?
A: Elective deliveries are generally recommended only at or after 39 weeks because earlier births are linked with higher rates of complications for babies, including respiratory distress and NICU admission. If your provider suggests delivery at 37 weeks, it is usually because continuing the pregnancy would pose greater risk than early birth.
Q: How can I tell if my water has broken?
A: Rupture of membranes may feel like a sudden gush of fluid or a steady trickle that you cannot control. If you are unsure whether the fluid is urine or amniotic fluid, contact your healthcare provider, who can test it. If your water breaks, you will be given instructions about when to go to the hospital or birth center.
Q: How often should I feel my baby move at 37 weeks?
A: Babies usually develop a recognizable pattern of activity and rest by late pregnancy. You should continue to feel regular movement each day. If you notice a significant decrease or no movement when you would normally expect it, call your provider or maternity unit for advice right away.
Q: When should I go to the hospital for contractions?
A: Many providers use guidelines such as contractions that are regular, increasingly strong, and coming every few minutes for at least an hour, or sooner if you live far from the hospital or have special circumstances. Always follow the specific instructions from your own care team, and go in immediately if you have heavy bleeding, severe pain, or think your baby is not moving normally.
References
- Committee Opinion No. 579: Definition of Term Pregnancy — American College of Obstetricians and Gynecologists (ACOG). 2013-11-01. https://www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2013/11/definition-of-term-pregnancy
- 37 Weeks Pregnant — American Pregnancy Association. 2019-01-01. https://americanpregnancy.org/healthy-pregnancy/week-by-week/37-weeks-pregnant/
- 37 Weeks Pregnant Guide — NHS (Best Start in Life). 2021-06-01. https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/3rd-trimester/week-37/
- 37 Weeks Pregnant: Baby Development, Symptoms and Tips — The Bump. 2022-04-01. https://www.thebump.com/pregnancy-week-by-week/37-weeks-pregnant
- Fetal Development: The Third Trimester — Mayo Clinic. 2022-07-06. https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/fetal-development/art-20045997
- Fetal Development: Stages of Growth — Cleveland Clinic. 2023-05-01. https://my.clevelandclinic.org/health/articles/7247-fetal-development-stages-of-growth
- Third Trimester: Weeks 37 to 40 — Kaiser Permanente. 2021-10-01. https://healthy.kaiserpermanente.org/health-wellness/maternity/third-trimester/weeks-37-40
