Table of Contents
- Introduction
- Baby Development at 39 Weeks
- Common Pregnancy Symptoms at 39 Weeks
- Preparing for Labor and Delivery
- Full-Term Pregnancy and Potential Induction
- Monitoring Pregnancy Beyond 40 Weeks
- When to Contact Your Healthcare Provider
- Conclusion
- References
Introduction
Congratulations on reaching the 39th week of your pregnancy! As you approach your due date, your baby is fully developed and ready to make their grand entrance into the world. This comprehensive guide will walk you through your baby's development, common symptoms you may experience, and essential steps to take as you prepare for labor and delivery.
Baby Development at 39 Weeks
Size and Weight
At 39 weeks, your baby is approximately the size of a mini-watermelon, measuring about 19.72 inches (50.1 cm) from head to toe and weighing around 7.57 pounds (3.4 kg) 12.
| Measurement | Value |
|---|---|
| Length | 19.72 inches (50.1 cm) |
| Weight | 7.57 pounds (3.4 kg) |
Continued Fat Accumulation
Your baby continues to build a layer of fat to help regulate their body temperature after birth. This fat accumulation contributes to their overall weight gain 3.
Interaction Readiness
Your baby has developed a firm grasp and coordinated reflexes, enabling them to interact with you immediately after birth. They can turn their head and will be able to see your face from a distance of 6 to 10 inches 4.
| Skill | Description |
|---|---|
| Grasp | Firm and coordinated |
| Reflexes | Well-developed |
| Head Control | Able to turn head |
| Vision | Can see 6-10 inches away |
Common Pregnancy Symptoms at 39 Weeks
Changes in Fetal Movement
Continue monitoring your baby's movements and notify your healthcare provider if you notice a significant decrease in activity 5.
Cervical Changes
Your healthcare provider may perform a cervical check to assess whether your cervix has begun to soften, thin out (efface), and open (dilate) in preparation for labor 5.
| Cervical Change | Description |
|---|---|
| Softening | Cervix becomes more pliable |
| Effacement | Cervix thins out |
| Dilation | Cervix begins to open |
Leaking Amniotic Fluid
If you suspect your water has broken, whether it's a gush or a slow leak of fluid, contact your healthcare provider immediately to reduce the risk of infection 5.
Diarrhea as a Potential Sign of Labor
Some women experience diarrhea in the days leading up to labor, possibly due to the release of prostaglandins that can stimulate both uterine and bowel contractions. However, there is no definitive proof that diarrhea is a reliable sign of impending labor 5.
Pelvic Pain and Discomfort
Pelvic pain is common during late pregnancy, affecting one in four women. To manage discomfort:
- Rest and avoid painful activities
- Limit heavy lifting, prolonged standing or walking, and strenuous exercise
- Find alternative ways to perform tasks that cause pain
- Seek support from others when needed
- Discuss pain management options with your healthcare provider 5
Mood Swings and Emotional Changes
Mood swings may intensify during the 39th week due to hormonal fluctuations, physical discomfort, and anticipation of labor and motherhood. Engage in self-care activities and seek support from loved ones. If you experience persistent feelings of sadness or thoughts of self-harm, contact your healthcare provider immediately 5.
Changes in Vaginal Discharge
You may notice changes in vaginal discharge, such as increased volume, mucus-like consistency, or brown or pink coloration. These changes are usually normal signs of approaching labor, but consult your healthcare provider if you have concerns 5.
| Discharge Type | Description | Significance |
|---|---|---|
| Increased volume | More discharge than usual | Normal |
| Mucus-like | Thick, sticky discharge | May indicate loss of mucus plug |
| Brown | Dried blood, often harmless | Normal |
| Pink or red | Fresh blood, "bloody show" | Sign of impending labor |
Preparing for Labor and Delivery
Understanding Postpartum Recovery
Familiarize yourself with the physical changes and recovery process you'll experience after giving birth, such as postpartum bleeding, soreness, and the gradual return of your pre-pregnancy body shape 5.
Gathering Entertainment Options
Prepare a list of shows to stream, books and magazines to read, or podcasts to listen to for distraction during the early stages of labor 5.
Stocking Up on Postpartum Essentials
Purchase necessary items for postpartum care, such as:
- Maxi pads with varying absorbency levels
- Comfortable, supportive postpartum underwear
- Nursing bras for comfort and support
- Peri bottles, donut-shaped cushions, and hemorrhoid pads (some may be provided by the hospital) 5
Documenting Pregnancy Memories
Consider journaling or writing letters to your baby to capture your emotions and experiences during the final weeks of pregnancy 5.
Full-Term Pregnancy and Potential Induction
At 39 weeks, your baby is considered full-term and fully developed. Some healthcare providers may recommend inducing labor at this point to reduce the risk of certain complications. Discuss the benefits and risks of induction with your doctor or midwife 5.
Monitoring Pregnancy Beyond 40 Weeks
If your pregnancy extends beyond your due date, your healthcare provider will closely monitor your progress, potentially increasing the frequency of prenatal visits and performing additional tests, such as non-stress tests, to ensure your baby's well-being 5.
When to Contact Your Healthcare Provider
Contact your healthcare provider immediately if you experience any of the following:
- Significant decrease in fetal movement
- Suspected leaking of amniotic fluid
- Persistent or severe pelvic pain
- Severe mood swings or thoughts of self-harm
- Heavy vaginal bleeding or unusual discharge
- Regular, painful contractions
Conclusion
As you navigate the 39th week of your pregnancy, remember to stay informed about your baby's development, be aware of common symptoms, and take steps to prepare for labor and delivery. Trust your instincts, and don't hesitate to reach out to your healthcare provider with any concerns. With a little patience and preparation, you'll soon be holding your precious newborn in your arms.
References
Footnotes
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Hadlock, F. P., Harrist, R. B., & Martinez-Poyer, J. (1991). In utero analysis of fetal growth: A sonographic weight standard. Radiology, 181(1), 129-133. https://doi.org/10.1148/radiology.181.1.1887021 ↩
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Vintzileos, A. M., Campbell, W. A., Rodis, J. F., Bors-Koefoed, R., & Nochimson, D. J. (1984). The ultrasound femur length as a predictor of fetal length. Obstetrics & Gynecology, 64(6), 779-782. https://pubmed.ncbi.nlm.nih.gov/6390277/ ↩
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Mayo Clinic. (2022). Fetal development: The 3rd trimester. https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/fetal-development/art-20045997 ↩
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MedlinePlus (ADAM). (2023). Fetal development. https://medlineplus.gov/ency/article/002398.htm ↩
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American College of Obstetricians and Gynecologists. (2024). How your fetus grows during pregnancy. https://www.acog.org/womens-health/faqs/how-your-fetus-grows-during-pregnancy ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12 ↩13