28th week of pregnancy: Welcome to the 3rd trimester – This is how your baby is developing!

28th Week of Pregnancy (Week 28)

Welcome to the final trimester of your pregnancy! With the 28th week of pregnancy begins an emotionally and physically intense phase. Your baby is now gaining weight more rapidly, practising breathing, moving arms and legs, and making its presence felt more strongly in your womb.

For many expectant mothers, this time is marked by a mix of anticipation, new physical symptoms, and important preparations. At the same time, you may notice just how important mental support from your partner or loved ones is right now – whether through conversations about the birth, the first essentials for your baby, or simply practical help with everyday life.

This is also the ideal time to start thinking about topics such as maternity leave, parental leave, dividing work after the birth, and a birth plan.

In this briefing, you’ll find out everything about your baby’s development, the changes in your body, common complaints – and receive valuable tips on how to enjoy the coming weeks feeling relaxed and well-prepared. After all, your baby is about to take its place in the world.

Week 28 of Pregnancy at a Glance

🍼 Your baby:
Length: approx. 35–37 cm (crown to heel)
Weight: approx. 1,000–1,200 g
Size comparison: about as big as an aubergine
Special features: opens its eyes for the first time, reacts to light & sounds
Development: start of REM sleep (dream phases), brain & lungs continue to mature
Position: still lots of movement, usually head up
Chance of survival if born prematurely: about 90%
Your body:
Trimester: 3rd trimester (start)
Month: 7th month of pregnancy
Physical changes: growing bump, pressure on stomach & bladder
Common complaints: shortness of breath, back pain, heartburn, water retention
Emotional state: stronger bond with baby, mental preparation for birth

Baby’s Development in the 28th Week

In week 28, your baby is about 35–37 cm long (crown to heel) and weighs roughly 1,000–1,200 grams. It is looking more and more like a newborn – with a rounder face, stronger fat reserves, and more defined muscles. The skin appears less translucent now, as fatty tissue forms underneath it.

The nervous system continues to mature, and the baby can react to touch, sounds, and light. The eyelids open and close, and the pupils respond to brightness. Dream sleep (REM sleep) also begins – your baby can dream!

The lungs are not yet fully mature but are making further progress. With each week, the chance of survival for premature babies increases significantly.

Your Body in the 28th Week of Pregnancy

Your bump continues to grow – many women now feel more pressure, heartburn, occasional shortness of breath, or sleep problems. The uterus is pressing more on your stomach and bladder, which can cause you to need to urinate more often.

Water retention, especially in your feet and hands, is also typical from this week onwards. Make sure to take regular breaks, elevate your legs, and wear loose clothing.

Your body continues to produce more blood to optimally supply your baby. At the same time, iron deficiency can occur – talk to your doctor or midwife about the right care.

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Tips for the 28th week of pregnancy

🤰 Balance movement & rest: Walks, pregnancy yoga or swimming help relieve discomfort and promote wellbeing.
🥗 Keep an eye on your diet: Make sure to eat an iron-rich, balanced diet and drink enough fluids.
📝 Plan for birth preparation: Sign up early for a birth preparation class – now is the ideal time.
🍼 Start preparing for breastfeeding: If you wish to breastfeed, start with gentle breast massages or find out about nursing bras and more.
📑 Sort out organisational matters: Apply for maternity leave and parental allowance in good time and, if necessary, inform your employer.

The most common questions about the 28th week of pregnancy

How big is my baby in the 28th week?

The crown-to-heel length is about 35–37 cm – your baby is roughly the size of an aubergine.

How does the baby's immune system develop?

The immune system is strengthened by antibodies from the placenta – an important protection until birth.

What does the start of the final trimester mean?

With week 28, the last third of pregnancy begins – your body is preparing for labour.

What is my baby's sleep-wake rhythm like?

Your baby is now developing a sleep-wake rhythm and can differentiate between being active and sleeping.

What are the chances of survival in the event of premature birth?

In the 28th week, the chances of survival for a premature baby are now about 90%, thanks to modern medicine.

What can I do about excessive weight gain?

Maintain a balanced diet – your weight gain should be checked regularly by your doctor.

Why is iron especially important now?

In week 28, iron requirements increase significantly, as your body produces more blood and the placenta supplies your baby.

What is surfactant and why is it important?

Surfactant is a substance in the air sacs of the lungs that makes breathing easier after birth – production increases from now on.

How does the abdominal wall change in week 28?

The abdominal wall becomes heavily stretched – stretch marks often appear, which is completely normal.

How can I help my baby get into the birth position?

Gentle movement and upright positions create space so your baby can turn into the optimal position for birth.

What role does the placenta play at this stage?

The placenta supplies your baby with nutrients and oxygen, and protects it from many complications.

How does life in the womb affect the baby?

Life in the womb is becoming increasingly interactive: your baby responds to sounds, light, and movements.

What should be on my checklist for the third trimester?

The checklist should include: birth preparation class, hospital bag, basic baby essentials, nursing bras, and all important questions for the midwife.

Can premature contractions occur already?

Yes, premature contractions are possible – if you have a regular hard bump or pain, you should contact your doctor immediately.

Which organs are currently developing most rapidly?

The lungs with their air sacs and the brain are making great progress now – everything is preparing for life after birth.