Pregnant woman with a full bump packing a hospital bag in a warm nursery, third trimester nesting
Pregnancy · Weeks 27-40

Third Trimester

The third trimester is the most physically demanding and emotionally intense part of pregnancy. You’re enormous, sleeping badly, and thinking about little else but the birth. Everything on this page is designed to help you feel genuinely prepared, not just reassured. There’s a difference.

Third Trimester Symptoms

What to expect physically in weeks 27-40

The discomforts that are completely normal

Back pain and pelvic girdle pain (PGP) are extremely common. PGP affects around 1 in 5 pregnant women and can range from mild to debilitating. A physical therapist can help significantly, ask your provider for a referral early.

Heartburn intensifies as baby pushes against your stomach. Sleep propped up, eat smaller meals, and avoid lying down after eating. If it’s severe, your midwife can prescribe antacids safe in pregnancy.

Swelling in feet and ankles is normal, especially in heat. Sudden, rapid swelling in hands, face, or feet, especially with headaches or visual changes, needs same-day medical attention (pre-eclampsia sign).

Braxton Hicks contractions increase in frequency and intensity. They’re irregular, don’t get progressively stronger, and ease with movement or position change. Real labor contractions are regular, intensify over time, and don’t stop.

Seek same-day help for these symptoms
  • Sudden severe headache or visual disturbance
  • Rapid swelling of face, hands, or feet
  • Reduced or absent fetal movements, always call, don’t wait
  • Heavy bleeding at any point
  • Gush of fluid before 37 weeks (possible preterm labor)
  • Pain that doesn’t ease
Fetal movements matter

There is no “slowing down near the end.” That is a myth. Call your hospital any time you are worried about movements. They will not think you are overreacting. It helps to count your baby’s movements so you know what is normal for them.

Birth Prep

Writing a birth plan that actually works

A birth plan isn’t a contract, it’s a communication tool. Keep it short, flexible, and focused on your real priorities.

Writing a birth plan, notes and planning in the third trimester

What to include

The most useful birth plans cover: where you want to give birth, who you want present, your feelings about pain relief (keeping it open is fine, you can always want more or less), preferences around intervention, the labor positions you’d like to try, skin-to-skin immediately after, cord cutting, vitamin K, and feeding intention. You can map all of these out with our birth plan template.

What not to do

Don’t write a multi-page document. Midwives and doctors often have minutes to read it. One A4 page is ideal. Use bullet points. The most effective birth plans communicate your values and preferences clearly, not a rigid script.

Build in flexibility: “I’d prefer X, but I understand if Y is needed for safety” is honest and useful. Labor rarely goes exactly as planned. That is not failure.

Signs of Labor

How to know when labor is starting

Early signs (can be days before active labor)

The show: a mucus plug, sometimes blood-tinged, as the cervix starts to efface. Labor may start within hours or days.

Nesting instinct intensifies. You may find yourself wanting to clean and organize everything at 3am. Normal.

Loose stools: the body’s way of clearing out before labor. Common in the 24-48 hours before.

Waters breaking: can be a dramatic gush or a slow trickle. If you think your waters have broken, call your hospital immediately regardless of whether contractions have started.

When to go to the hospital or call your midwife

Contractions that are regular, lasting 45-60 seconds, and coming every 3-5 minutes for first babies (sooner for subsequent pregnancies). It helps to time your contractions so you can describe the pattern when you call.

Any time you’re worried: call. The midwives would rather hear from you.

The 5-1-1 rule for first-time parents
Contractions every 5 minutes, lasting 1 minute, for 1 hour. Then head in or call ahead. Some hospitals prefer 4-1-1, check with yours in advance.
On the move

Travelling in the third trimester

Travel gets more restricted as your due date nears. Plan carefully, and stay closer to home in the final weeks.

Travelling while pregnant in the third trimester

Most airlines need a letter from your midwife or doctor confirming your due date after about 28 weeks, and many will not let you fly after 36 to 37 weeks (sooner for twins). Check the exact policy for your airline well before you travel.

Long journeys raise the risk of blood clots, so move every hour, keep hydrated, and wear compression socks. Break up long car trips with regular stops.

In the last few weeks it is wise to stay near your hospital. If you do travel, carry your pregnancy records and know where the nearest hospital is.

Quick travel checklist
  • After 28 weeks: carry a midwife’s or doctor’s letter
  • Many airlines stop flights after 36 to 37 weeks
  • Move hourly, hydrate, wear compression socks
  • Stay close to home near your due date
  • Always carry your pregnancy records

Ready to learn about labor & birth?

Pain relief, birth options, what happens in the room, everything explained clearly, without fear-mongering.

Labor & birth guide →

Medical disclaimer: The content on this website is provided for informational and educational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your doctor, midwife, or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay seeking it because of something you have read on this website.