Week 34: The Lungs Are Maturing

Your baby is now well over 2 kg and the lungs are almost fully developed! Surfactant production is in full swing, which is essential for baby to be able to breathe independently. Your body is working hard, and you're likely feeling it.

With just six weeks until your due date, it's a good time to plan your leave from work, pack your hospital bag, and make the final practical preparations.

Baby's Development

Lungs: Almost fully mature with good surfactant production — the substance that prevents the air sacs from collapsing
Nervous system: The central nervous system is maturing rapidly and baby is developing increasingly better control over bodily functions
Fat layer: Baby is still putting on fat and looks rounder and more newborn-like
Vernix: The protective, white coating on the skin is getting thicker and protects against the amniotic fluid
Weight and length: Baby weighs around 2.1–2.4 kg and measures about 45 cm
Immune system: Continues to receive antibodies from you via the placenta
Eye color: The iris is now colored, but eye color may still change after birth
Fingerprints: Baby's unique fingerprints are fully formed

Lung Maturation in Detail

Surfactant is one of the most important substances the body produces. It coats the inside of the alveoli (air sacs) and prevents them from collapsing when you exhale. Without surfactant, baby would not be able to breathe.

Production began around week 24, but now in week 34, levels are almost where they need to be. Babies born in week 34 therefore have good chances of breathing independently, although some may need a little extra help in the first period.

According to the NHS and ACOG, babies born from week 34 generally do well, but may need monitoring and possibly warming support in a neonatal unit. Every extra day in the womb gives the lungs and brain valuable maturation time.

Your Body

Pelvic pressure: You may feel more downward pressure as baby grows and moves deeper
Fatigue: Your body is using a lot of energy, and you're probably tired — needing more rest now is completely normal
Nesting instinct: Many experience a strong urge to tidy, clean, and organize — enjoy it, but don't overexert yourself
Heartburn: Continues to trouble many. Eat small, frequent meals and avoid lying down right after eating
Back and pelvic pain: The extra weight puts strain on the back. Swimming, physiotherapy, and a pelvic support belt can help
Swelling: Ankles and feet swell particularly toward the end of the day. Elevate your legs when you can
Breathlessness: The uterus is pressing on the diaphragm. Take it easy and breathe deeply

The Nesting Instinct

The nesting instinct is a well-known phenomenon in the third trimester. Many pregnant people experience a sudden and intense urge to get the home ready for baby — washing windows, organizing wardrobes, setting up the nursery, and tidying everything that can be tidied.

This energy surge can come in the middle of a period of great fatigue, and it's completely natural. Enjoy the motivation, but be mindful to:

Not lift heavy objects (over 10–12 kg)
Take regular breaks
Ask for help with tasks requiring ladders or climbing
Avoid strong cleaning products and ensure good ventilation

Good to Know

Babies born in week 34 generally do well, but often need some extra care in hospital. According to the NHS and AAP, preterm babies (born before week 37) may need help with temperature regulation, feeding, and breathing. The lungs are almost ready, but the final weeks in the womb make a significant difference. Every day counts!

Now is a good time to plan for the postnatal period. Think through who can help in the first weeks, what you need in terms of food and supplies, and how you and your partner can share tasks. Many find it helpful to fill the freezer with meals in advance.

Remember that Braxton Hicks contractions are normal and harmless. They are characterized by being irregular and easing if you rest or change position. Real contractions get stronger and come at more regular intervals. Use a contraction timer app if you're unsure.

Short walks and gentle swimming are still safe and recommended. According to ACOG, pregnant people should aim for at least 150 minutes of moderate-intensity physical activity per week. Listen to your body — if it hurts, take a break. Avoid activities with a risk of falling and heavy lifting.

Work and Maternity Leave

Planning Your Leave

Maternity leave policies vary by country. Most countries require you to start maternity leave at some point before your due date. Check your specific entitlements and any notification requirements for your employer.

Many choose to start leave earlier if:

The job is physically demanding
The commute is long
There are pelvic pain or other complaints
There are complications in the pregnancy

Medical Leave vs. Early Maternity Leave

If you're unwell or have pregnancy-related problems that make it difficult to work, your doctor may sign you off sick. Sick leave typically does not count against your maternity leave allocation. Talk with your doctor and employer about what works best for your situation.

Preparing Your Employer

Agree on a handover date for your tasks
Create an overview of ongoing projects
Inform colleagues about who will cover for you
Clarify availability during your leave

Exercise in Week 34

Moderate exercise is still recommended, even though your body feels heavier. Regular movement helps with many common complaints.

Good Activities Now

Swimming: Wonderful for relieving the back and joints. The water gives a blissful feeling of weightlessness
Short walks: 15–30 minutes daily keeps your body moving
Prenatal yoga: Focus on breathing exercises and hip-opening postures that prepare you for birth
Pelvic floor exercises: Daily training gives stronger muscles for birth and faster recovery
Birth ball exercises: Sitting on an exercise ball can relieve pelvic pressure and help baby into a good position

Important to Remember

Avoid exercises on your back — the uterus may press on the vena cava
Listen to your body and rest if uncomfortable
Stay hydrated
Avoid activities with a risk of falling

Breastfeeding Preparations

Breastfeeding Classes

Many hospitals and birth centers offer breastfeeding classes in the third trimester. It's recommended to prepare for breastfeeding before birth. A class typically covers:

Breastfeeding positions and latching
What to expect in the first days
Common challenges and solutions
Where to get help after birth

Read Up

In the first days, your breasts produce colostrum (first milk), which is nutritious and full of antibodies. Full milk production typically comes in 2–4 days after birth.

Hospital Bag

Make sure your hospital bag is packed and ready. Have it standing by the door from week 36.

Don't Forget

ID and health/insurance documents
Your birth plan
Comfortable clothes for birth and afterward
Nursing bra and nursing pads
Clothes for baby (onesies, sleepsuit, hat, socks in newborn size)
Car seat for the ride home

Nutrition and Energy

In week 34, baby is growing rapidly and needs good nutrition from you. You need about 300 extra calories per day in the third trimester.

Iron-Rich Foods

Baby is building up iron stores now:

Red meat, liver (in moderate amounts)
Beans, lentils, and chickpeas
Leafy greens (spinach, kale)
Whole grain products
Always combine with vitamin C (orange, bell pepper) for better absorption

Freezer Meals for the Postnatal Period

Now is a good time to start preparing freezer meals:

Cook double portions of dinners and freeze them
Soups and stews are perfect for freezing
10–15 portions give a good buffer for the first weeks
Label bags with contents and date

Postnatal Preparations

Who Can Help?

Talk with your network about who can contribute in the first weeks:

Family who can cook, shop, or look after older children
Friends who can bring dinner or take a turn with the pram
Neighbors who can help with housework

Healthcare Support

Check what postnatal support is available from your local healthcare services. In many countries, a midwife or health visitor will come to your home in the first days or weeks after birth. Baby will then be followed up with regular check-ups. Find your local maternal and child health services and register if needed.

For Your Partner

Help with practical preparations at home — assembling the cot, organizing baby clothes and equipment
Come to the prenatal appointment if possible — it strengthens your connection and gives you a shared understanding
Practice the route to the hospital and make sure the car has enough fuel
Read about signs of labor — what do you do when it starts?
Pack your own bag for the hospital with snacks, charger, change of clothes, and something to read

Tips for Week 34

Maternity leave: Clarify your leave start date with your employer, taking note of any mandatory leave periods before your due date
GBS: Ask your midwife whether GBS testing is recommended for you
Pelvic floor exercises: Continue daily — they help both during and after birth
Breastfeeding class: Many hospitals offer classes — good to sign up now
Signs of labor: Read up on the difference between Braxton Hicks and real contractions — use a contraction timer app to track them
Postnatal preparation: Make a plan for who can help after birth, and fill the freezer if you can
Car seat: Make sure the car seat is bought and that you know how to install it

When to Contact a Doctor

Contact your doctor or midwife if you experience:

Persistent headache that doesn't resolve with normal pain relief
Visual disturbances like flashing lights or blurred vision
Regular contractions increasing in strength and coming more than every 10 minutes
Reduced fetal movements compared to normal pattern
Fluid leaking from the vagina
Sudden severe swelling in face or hands
Vaginal bleeding
Fever above 38°C (100.4°F)

Never hesitate to contact your maternity unit. They are used to these calls and will happily help you assess what you're experiencing.

Did You Know...?

Surfactant, the substance that prevents the alveoli from collapsing, is one of the most important substances the body produces. Without it, baby would not be able to breathe. Production started around week 24, but now it's almost at full capacity
Baby can now recognize and prefer your native language. Studies have shown that newborns suck faster on a pacifier when they hear their mother's language compared to a foreign language
Vernix, the white coating on baby's skin, is a unique substance that protects the skin from amniotic fluid and has antibacterial properties that are also useful after birth
Your baby now has approximately as many brain cells as an adult — around 100 billion neurons. It's the connections between them that continue to develop intensively in the final weeks
Baby's fingerprints are fully formed in week 34 and will remain unique for the rest of their life

Common Questions About Week 34

What is the difference between Braxton Hicks and real contractions?

Braxton Hicks contractions are irregular, vary in strength, and ease or disappear when you rest or change position. Real contractions come at regular intervals that gradually shorten, increase in strength, and don't stop no matter what you do. Contact your midwife if you're unsure.

Is it normal to feel this tired?

Yes, extreme fatigue is very common in the third trimester. Your body is using enormous amounts of energy to support baby's growth, and sleep quality is often poor. Listen to your body's signals and rest when you need to — short rest periods during the day can make a big difference.

What is the nesting instinct I keep hearing about?

The nesting instinct is a strong urge to tidy, clean, organize, and prepare the home for baby. Many people experience this in the third trimester, and it can bring an unexpected energy boost. Enjoy it, but remember not to overexert yourself — it's important to save energy for the birth.

When should I start maternity leave?

This depends on your country's regulations and your specific situation. Check what mandatory leave periods apply before your due date. Many choose to start a bit earlier if the job is physically demanding. Remember that sick leave doesn't count against your maternity leave entitlement.

Will baby be okay if born now?

Yes, babies born in week 34 generally have good outcomes. The lungs are almost fully matured and baby can usually breathe independently. Some need a little extra help with temperature regulation and feeding in the first period. But it's best for baby to stay in the womb as long as possible.

What should I eat now?

You need about 300 extra calories per day in the third trimester. Focus on nutritious food: lean proteins, whole grains, fruit, vegetables, and healthy fats. Iron is especially important now — choose red meat, beans, and leafy greens. Drink at least 2 liters of water daily.

Is it normal to feel pelvic pressure and heaviness?

Yes, as baby grows and moves deeper into the pelvis, you'll feel more downward pressure. It can feel like a heaviness in the pelvis, especially when walking and standing. Rest with your legs elevated, avoid standing for long periods, and use a pelvic support belt if needed. Contact your midwife if the pressure is constant and intense.

Can baby sense that I'm stressed?

Yes, research suggests that prolonged stress can affect baby through stress hormones that cross the placenta. Brief, normal everyday stress is not harmful. But where possible, it's recommended to reduce stress through relaxation, physical activity, good sleep, and social support. Talk to your midwife if you're experiencing sustained high stress levels.

What is gestational diabetes?

Gestational diabetes is elevated blood sugar that occurs during pregnancy. It's usually detected at a glucose tolerance test around week 24–28. It affects about 5–10% of pregnancies. Risk factors include being overweight, being over 25, and a family history of diabetes. Treatment involves dietary changes, exercise, and sometimes insulin. The condition usually resolves after birth.

What should I know about preeclampsia now?

Preeclampsia can develop in the third trimester and affects approximately 3–5% of pregnancies. Symptoms include high blood pressure, protein in the urine, persistent headache, visual disturbances, pain under the right ribs, and sudden severe swelling in the face and hands. Your midwife checks blood pressure and urine at every appointment. Contact hospital immediately if you have symptoms.

What about dental health in pregnancy?

Hormonal changes during pregnancy can make gums more swollen and prone to bleeding (pregnancy gingivitis). Brush your teeth well twice a day, use floss, and visit your dentist for a regular check-up. Dental treatment is safe during pregnancy. Some people find morning sickness makes toothbrushing difficult — try a milder toothpaste if needed.

Is it normal to have more vivid dreams now?

Yes, many pregnant people report more vivid and intense dreams, especially in the third trimester. This is likely due to hormonal changes, more frequent waking (which means you remember dreams better), and the many thoughts and feelings around birth and parenthood. It's completely normal and harmless.

What is vernix?

Vernix caseosa is the whitish, waxy coating on baby's skin. It protects the skin from amniotic fluid and has antibacterial properties. Some babies are covered in a lot of vernix at birth, others have little — both are normal. Research suggests vernix also provides benefits after birth, and many recommend leaving it on the skin rather than washing it off immediately.

What does it mean when baby is "engaged"?

When a midwife says baby is "engaged," it means the head has begun to descend into the pelvis. For first-time parents, this can happen as early as week 34–36, while for those who have given birth before it often doesn't happen until labor starts. When the head is engaged, you may find it easier to breathe but need to urinate more frequently.

Next week: The brain is growing rapidly and baby is almost fully developed.