Welcome to the Third Trimester
The third trimester spans weeks 28 through 40 (or beyond). By now, your bump is undeniable, sleep may be a distant memory, and the reality of meeting your baby is setting in. This trimester is about physical preparation, emotional readiness, and getting everything in place for the big arrival.
What's Happening With Your Baby
Your baby does an enormous amount of growing in these final weeks:
- Weeks 28–31: The brain is developing rapidly. Baby can blink, dream, and may respond to light. They're building fat stores under their skin.
- Weeks 32–35: Bones are hardening (except the skull, which stays soft for birth). Baby is practicing breathing movements. Most organs are fully developed.
- Weeks 36–40: Baby is considered full-term at 39 weeks. They're gaining about half a pound per week. The head typically moves into the pelvis in preparation for birth.
What's Happening With Your Body
The third trimester brings some of pregnancy's most intense physical changes:
- Braxton Hicks contractions — practice contractions that feel like tightening but are typically irregular and painless
- Backache and pelvic pressure — as the baby drops and your body prepares for labor
- Heartburn and indigestion — the growing uterus pushes up against your stomach
- Swelling (edema) — especially in feet and ankles; elevation and hydration help
- Sleep difficulties — finding a comfortable position becomes increasingly challenging
- Frequent urination — baby's head may press on your bladder
- Colostrum — your breasts may begin producing this first milk
Your Third Trimester To-Do List
- Attend all prenatal appointments. These become more frequent in the third trimester — typically every two weeks, then weekly from week 36.
- Create your birth plan. Consider your preferences for pain management, who will be present, and immediate post-birth wishes. Share it with your care team and keep it flexible.
- Take a childbirth class. Whether in-person or online, good preparation significantly reduces birth anxiety.
- Pack your hospital bag. Aim to have it ready by week 36. Include items for you, your partner, and your newborn.
- Install the car seat. Many hospitals won't let you leave without one properly installed.
- Prepare for breastfeeding (if applicable). A lactation consultant visit before birth can make a huge difference.
- Set up the nursery — but don't stress about perfection. Babies don't care about the décor; they care about you.
Signs of Labor to Know
Understanding the difference between early labor and "it can wait" symptoms helps you feel more confident as your due date approaches:
| Sign | What It Means |
|---|---|
| Regular contractions every 5 min, lasting 1 min, for 1 hour | Time to head to the hospital (the 5-1-1 rule) |
| Water breaking | Call your care provider immediately |
| Bloody show (mucus plug) | Labor is approaching, often within days |
| Braxton Hicks (irregular) | Practice contractions — not active labor |
| Decreased fetal movement | Call your provider right away |
Taking Care of Your Mental Health
Birth anxiety is extremely common. If you're feeling worried about labor, the responsibility of a newborn, or changes to your relationship and identity — that is completely normal. Talking to your partner, a trusted friend, or a therapist can help enormously. You do not have to pretend to feel nothing but joy.
A Note of Encouragement
Your body is doing something remarkable. However these final weeks feel — uncomfortable, exciting, terrifying, beautiful — you are almost there. Trust the process, lean on your support system, and know that women have been doing this forever. You've got this.