The third trimester starts at week 28 and continues until birth. Most pregnancies last 40 weeks, but it’s normal for some babies to be born up to week 42. After 42 weeks, doctors may suggest induction.
Third Trimester Symptoms
As your baby grows bigger, your body changes in many ways. Here are some symptoms you may face:
1. Back pain & pelvic pressure
Hormonal changes loosen your ligaments. Add in the weight of your belly, and your lower back can ache.
2. Shortness of breath
With less space in your chest cavity, deep breaths can feel harder. This may ease once your baby “drops” lower (called lightening).
3. Frequent urination / urinary pressure
Your bladder faces more pressure, so bathroom trips increase. Sometimes minor leaks can occur when you cough or laugh.
4. Braxton Hicks contractions (“practice” contractions)
These are irregular, mild tightenings that do not consistently intensify. They are the body’s way of “rehearsing.”
5. Heartburn, indigestion, constipation
Digestive troubles worsen as your uterus pushes on your intestines and stomach.
6. Swelling (edema), varicose veins, hemorrhoids
Fluid retention and poor circulation can cause swelling, especially in the ankles, hands, or face. Varicose veins and hemorrhoids may become more visible.
7. Fatigue, insomnia & sleep trouble
Discomfort, frequent urination, and leg cramps can make sleep elusive. Anxiety about labor may also play a role.
8. Nesting urge & emotional changes
Many expectant mothers feel a burst of energy and a desire to “nest”—organizing, cleaning, preparing. Emotionally, it’s normal to feel a mix of excitement, worry, and fatigue.
Baby Development in the Third Trimester
This is a time of fast growth and development:
- Week 30: Baby is about 15.7 inches and 2.9 pounds. The brain gets more wrinkled. The baby can grasp a finger.
- Week 31: Baby is over 15.5 inches and 3.5–4 pounds. Body fat increases. The baby starts controlling body temperature.
- Week 32: Baby is about 16.7 inches and 4–4.5 pounds. Major development is done. Baby practices breathing.
- Week 33: Baby is about 17.2 inches and 4.2 pounds. Bones harden, but the skull stays flexible. The baby moves and blinks. Mom may feel more discomfort.
- Week 34: Baby is about 17.7 inches and 4.7 pounds. The body stores minerals like iron and calcium. Hearing, vision, and breathing improve.
- Week 37: Baby is about 19.1 inches and 6–7 pounds. The heart, muscles, and bones are fully developed. Lungs, brain, and nerves are still maturing.
What to Avoid During the Third Trimester
Stay mindful of potential risks:
- Skip heavy lifting and avoid any strenuous activities that strain your back or increase risk of falling.
- Steer clear of smoking, alcohol, and excessive caffeine seek professional help if needed.
- Stay hydrated. Don’t ignore unusual symptoms. Heavy bleeding, sharp stomach pain, or major swelling? Call your doctor right away.
When to Reach Out to Your Doctor in the Third Trimester
Be proactive. Reach out if you experience any of the following:
- Regular, frequent contractions (e.g., more than six per hour that grow stronger) could signal preterm labor.
- Sudden decrease in baby’s movement or any concerning pain or bleeding.
- Unusual headaches, vision changes, swelling possible signs of preeclampsia.
- Emotional overwhelm, anxiety, or alarming mood shifts mental health matters too.
Third Trimester Checklist
Here’s your curated to-do list to stay organized and calm:
- Track baby’s kicks aim for 10 distinct movements within 2 hours.
- Plan your birth preferences choose your support person, pain management, and birthing environment.
- Pack your hospital bag now. Include comfy clothes, toiletries, diapers, a baby outfit, blankets, and important documents.
- Finish nesting tasks: set up nursery, install car seat, stock up on supplies.
- Attend prenatal and childbirth classes, breastfeeding or infant CPR sessions.
- Schedule tours of your birthing facility and confirm pediatrician for the baby.
- Finalize logistics: ensure vehicle readiness, backup childcare (if applicable), support system for postpartum.
Medically Approved Exercises & Tips in Third Trimester
Stay active and comfortable:
- Kegels (Pelvic floor exercises) help with urinary incontinence and support labor.
- Walking a safe, low impact cardio option; aim for 15–50 minutes depending on comfort; keeps you active without overexertion.
- Prenatal yoga, foam rolling, stretching, squats help open hips, relieve aches, and prepare your body for birth.
- Listen to your body: stay hydrated, avoid overheating, and stop if you feel dizzy or unusually fatigued.
Final Thoughts
The third trimester is intense and emotional, with lots of excitement. Know when it begins and ends. Watch for symptoms and track your baby’s growth. Avoid risks and make a checklist. Move carefully and know when to call the doctor. This helps you feel ready and confident.
Frequently Asked Questions:
Answers to common questions and myths about the third trimester to help expectant parents understand what to expect and how to prepare.
