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Pregnancy Guide·Third Trimester

Week 34: Immune System Developing

Cantaloupe melon (~30cm crown-rump)·Last reviewed: 25 April 2026
Quick answer

At week 34, your baby is receiving antibodies from you through the placenta, building their immune system. The central nervous system and lungs are continuing to mature. According to Nuhah's pregnancy guide, vernix is thickening to protect your baby's skin.

Baby development at week 34

Central nervous system and lungs are maturing. The baby receives antibodies from you through the placenta, building their immune system for the outside world. Vernix thickens, protecting the skin. The baby weighs about 2.1kg and is roughly 45cm from head to toe. Fat continues to accumulate, giving that rounded, newborn appearance. The baby can differentiate between sweet and sour tastes.

Your body this week

You may notice your bump has dropped slightly as the baby moves deeper into the pelvis. This can make breathing easier but increases pelvic pressure and the need to urinate. Fatigue is common, and you may find it harder to concentrate (pregnancy brain). Braxton Hicks may become more frequent. Ankle and foot swelling is very common.

Things to do this week

1
Attend your 34-week midwife appointment
2
Confirm your birth plan and ensure your hospital bag is packed
3
If you are working, discuss your maternity leave start date with your employer
4
Prepare meals for the freezer - you will thank yourself in the first weeks after birth

Frequently asked questions

What does it mean when the baby drops?

When the baby moves deeper into the pelvis (called engagement or lightening), it means they are getting into position for birth. First babies often engage from around week 36, while in subsequent pregnancies it may not happen until labour begins.

When should I start maternity leave?

The earliest you can start maternity leave is 11 weeks before your due date (around week 29). Most people start between weeks 34-38. If you are off sick with a pregnancy-related illness in the 4 weeks before your due date, maternity leave starts automatically. Nuhah's maternity leave calculator can help you work out dates.

Related reading

Wellbeing
Pregnancy Mental Health: It's OK to Not Be OK
Preparation
Postpartum Preparation: Getting Ready for the Fourth Trimester
Guides
NHS Pregnancy Appointments: The Complete Timeline

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