Third Trimester of Pregnancy: Symptoms, Baby Development & Preparing for Birth

Welcome to the third trimester—your final stretch of pregnancy! Spanning weeks 28 to 40, this phase brings rapid baby growth and new physical demands. Whether you’re battling third trimester back pain or eagerly counting kicks, this guide covers everything from what weeks are third trimester to managing abdominal pain pregnancy third trimester. Let’s prepare you for the home stretch with confidence and care.

What is the Third Trimester?

The third trimester begins at week 28 and lasts until delivery (typically week 40), answering the common question, “when is third trimester?” This period focuses on baby’s final development and your body’s preparation for labour. For those in their third pregnancy third trimester, symptoms like tired third trimester fatigue or third trimester pelvic pain may feel more intense—listen to your body and prioritize rest.

Third Trimester Symptoms: What to Expect

  1. Braxton Hicks Contractions: Practice contractions intensify as your uterus rehearses for labour.

  2. Third Trimester Back Pain: Aching caused by baby’s weight and shifting posture—use maternity belts for support.

  3. Headache Third Trimester: Often linked to hormonal shifts or dehydration; monitor for pre-eclampsia signs (e.g., blurred vision).

  4. Abdominal Pain Pregnancy Third Trimester: Includes harmless round ligament pain or concerning cramping (seek help if severe).

  5. Tired Third Trimester Fatigue: Energy dips as your body supports rapid baby growth—nap often!

  6. Third Trimester Pelvic Pain: “Lightning crotch” strikes due to nerve pressure—try pelvic tilts or warm compresses.

⚠️ Danger Signs:

  • Severe headache third trimester with swelling or vision changes.

  • Persistent abdominal pain or reduced fetal movement.

  • Fluid leakage or bleeding.

Your Baby’s Development: Weeks 28–40

Track third trimester week milestones:

  • Week 28: Eyes open; baby detects light.

  • Week 32: Gains half a pound weekly.

  • Week 36: Lungs mature; baby settles head-down.

  • Week 40: Full-term and ready to meet you!

Managing Discomfort: Pro Tips

  • For Back Pain: Prenatal yoga, warm baths, and supportive footwear.

  • For Pelvic Pain: Use a birthing ball to relieve pressure.

  • For Fatigue: Delegate tasks and prioritize sleep (yes, naps count!).

Third Trimester FAQs

Q: When does the third trimester start, and how long is it?
A: It begins at week 28 and lasts until birth (usually week 40).

Q: Are headaches normal in the third trimester?
A: Occasional headache third trimester is common, but sudden/severe pain with swelling could signal pre-eclampsia.

Q: What causes abdominal pain during this phase?
A: Abdominal pain pregnancy third trimester can stem from ligament stretching, Braxton Hicks, or labor signs.

Q: How can I ease pelvic pain?
A: Third trimester pelvic pain responds to stretches, warm compresses, and avoiding sudden movements.

Final Checklist:
✅ Pack your hospital bag by week 36.
✅ Finalize your birth plan.
✅ Track baby movements daily.
✅ Rest—your body is working overtime!

By understanding what week is third trimester challenges and celebrating milestones, you’ll navigate these final weeks with resilience. Trust your strength, mama—you’re almost there!