Week 20: Welcome to Halfway!

Congratulations — you have reached the halfway point of pregnancy! Week 20 is a major milestone. Your baby has grown from a microscopic cell into a recognisable little human weighing around 300–350 grams and measuring about 24–25 cm from head to heel. Over the next 20 weeks, your baby will more than triple in length and increase in weight almost tenfold.

This week is also often the time for the anatomy scan, where you get to see your baby in detail and may choose to find out the sex. According to ACOG and the NHS, this scan is typically performed between weeks 17 and 20 and is a voluntary part of standard prenatal care.

You are now in one of the most comfortable phases of pregnancy. The bump is visible, but not yet so large that it gets in the way. Energy levels are good, and many people truly enjoy this period.

Baby's Development

Brain growing rapidly: Millions of nerve cells are forming, and neural pathways essential for movement and cognitive function are developing at speed
Hearing is clear: Your baby can now hear voices and sounds from the outside world. Your voice and your partner's can be perceived through the amniotic fluid
Coordinated movements: Your baby is practising reflexes and coordinated movements. Many babies suck their thumb during the anatomy scan
Heart: The heart beats strongly at 110–160 beats per minute and can be heard with a stethoscope
Vernix caseosa: A whitish, waxy coating now covers your baby's skin, protecting it from the amniotic fluid
Eyebrows forming: Your baby's facial features are distinct, and the eyebrows are beginning to take shape
Digestive system: Your baby is swallowing amniotic fluid, which passes through the digestive system and exercises the intestines
Size: Your baby is about 25 cm long (head to heel) and weighs 300–350 grams

Vernix Caseosa — Your Baby's Natural Protection

Vernix caseosa is the whitish, fatty coating that now covers your baby's skin. It is made up of sebaceous gland secretions, skin cells, and lanugo (the fine body hair). Vernix has several important functions:

Protects the skin from the amniotic fluid, which would otherwise dry it out and cause irritation
Makes it easier for your baby to slide through the birth canal during delivery
Has antibacterial properties that protect your baby from infections
Acts as a moisturiser for your baby's skin after birth

Babies born around full term may still have remnants of vernix on their bodies. Research suggests it can be beneficial to wait at least 24 hours before the first bath, allowing the vernix to absorb into the skin and provide natural protection.

Your Body

Uterus at the navel: The uterus has grown up to the navel or just above. The growing bump is now clearly visible to everyone
Weight gain: According to ACOG, a weight gain of 5–7 kg by week 20 is typical for people with a normal pre-pregnancy BMI, but this varies
Increased blood volume: Blood volume has increased by 40–50 percent to support the placenta and your baby's circulation
Heart working harder: Your heart is now pumping 30–50 percent more blood per minute than before pregnancy
Lower blood pressure: Blood pressure is often slightly lower than normal in the second trimester, which can cause dizziness
Back pain: The growing bump shifts your centre of gravity and can cause lower back pain
Heartburn: The growing uterus presses upward against the stomach, which can cause acid reflux
Swelling: Mild swelling in the legs and feet towards the end of the day is normal

The Halfway Milestone

Week 20 is a good moment to pause and reflect on the journey so far. Your body has done remarkable work building a new human. Here is what has happened in the first 20 weeks:

The uterus has grown from the size of a pear to a melon, now weighing around 350 grams (compared to 60 grams before pregnancy)
Blood volume has increased by approximately 50 percent
The placenta now filters around 500 litres of blood per day
Your baby has developed all its organs and systems
You have had around five to six prenatal appointments

The next 20 weeks are primarily about growth and maturation. Your baby will gain significant weight, the lungs will mature, and the brain will continue its rapid development.

The Anatomy Scan

Around weeks 17–20, the anatomy scan is offered as part of standard prenatal care. According to ACOG and the NHS, this is one of the most anticipated appointments during pregnancy.

What Is Examined

The sonographer will check:

Your baby's head, brain, face, and spine
The four chambers of the heart, valves, and blood flow
Lungs and diaphragm
Stomach, kidneys, and bladder
Arms, legs, fingers, and toes
Placental position and function
Amount of amniotic fluid
Blood flow in the umbilical cord

Sex

If you want to find out your baby's sex, the sonographer can often see this depending on your baby's position. Let the sonographer know clearly in advance whether you want to know or prefer to keep it a surprise.

What If Something Is Found?

The vast majority of people (about 97 percent) receive completely reassuring results. If the scan shows something unclear, the sonographer will either ask you to come back for a repeat examination (your baby may have been lying in an awkward position) or refer you to a specialist for a more detailed assessment. Try not to worry in advance.

After the Scan

Ask for a printout of the ultrasound image as a keepsake
Discuss any findings with your midwife or doctor at the next appointment
Your next routine prenatal appointment is usually around week 24

Fetal Movements

Around week 20, most pregnant people can feel their baby's movements — a magical moment!

What Does It Feel Like?

Early movements are often described as:

Butterflies in the stomach
Light bubbling sensations or gas bubbles
A gentle tickling or tingling feeling
Soft tapping or light puffs
Small twitches in the lower abdomen

When Will You Feel It?

First-time parents: Often weeks 18–22, sometimes later
Second or third pregnancy: Movements may be noticed earlier (weeks 15–18)
Placental position: An anterior placenta (at the front) can make movements less noticeable

Important About Fetal Movements

At week 20, it is too early to count kicks systematically — this is generally not recommended until weeks 24–28. At this stage, the focus is on getting to know your baby's rhythm and movement pattern. Over time, you will naturally notice changes in activity level.

Tip: Movements are often most noticeable when you are resting or lying down, especially in the evenings and after meals.

Parental Leave — Time to Start Planning

Week 20 is a good time to begin thinking about parental leave. Rules vary significantly by country and employer, so it is worth starting to gather information now.

What to Think About Now

Talk to your employer about planning your leave start date
Find out whether your employer provides full salary beyond the statutory minimum
Discuss with your partner how you would like to divide leave between you
Check the specific parental leave rules in your country — requirements for application timing vary
Start thinking about finances during the leave period

Application Timing

Most countries require you to notify your employer several weeks or months in advance. Check the rules that apply to you and your employer — the sooner you start planning, the better.

Nutrition and Health

Key Nutrients

Iron: Important for the increased blood volume. Good sources include red meat, lentils, beans, and fortified cereals. According to ACOG and WHO, pregnant people need around 27 mg daily
Calcium (around 1,000 mg/day): For your baby's bones and teeth. According to ACOG, dairy products, leafy greens, and almonds are good sources
Protein: Eat protein-rich food at every meal to support your baby's growth
Omega-3 (DHA): For brain and eye development. According to ACOG and WHO, oily fish like salmon, mackerel, and sardines 2–3 times per week is recommended
Vitamin D (600 IU / 15 micrograms per day): According to ACOG, supplements are recommended for all pregnant people
Fibre: Helps prevent constipation, which is common during pregnancy

What to Avoid

Alcohol (no safe amount according to WHO and ACOG)
More than 200 mg caffeine daily (equivalent to about two cups of coffee)
Fish high in mercury (shark, swordfish, king mackerel, tilefish, fresh tuna in large amounts)
Raw or undercooked meat and fish (risk of toxoplasmosis and listeria)
Soft and mould-ripened cheeses (risk of listeria)
Unpasteurised dairy products

Exercise and Physical Activity

Recommendations from ACOG and WHO

At least 150 minutes of moderate activity per week
Safe options: walking, swimming, prenatal yoga, Kegel exercises, adapted strength training
Avoid: Contact sports, activities with a risk of falling, exercising while lying flat on your back

Benefits of Exercise During Pregnancy

Reduced risk of gestational diabetes
Better sleep quality and more energy
Fewer musculoskeletal complaints
Improved mental wellbeing and mood
Easier labour and faster recovery
Prevention of excessive weight gain

Sleep and Rest

Tips for Better Sleep

Sleep on your side: ACOG and the NHS recommend side-lying, preferably the left side, for optimal blood flow to your baby
Use pillows: Place a pillow between your knees and under your bump for support
Cool, dark room: Creates an optimal sleep environment. Many pregnant people experience increased body heat
Establish a routine: Go to bed and wake up at the same time each day
Limit fluids in the evening: To reduce the need for night-time bathroom visits
Avoid screen time: Blue light from screens can disrupt sleep

Mental Health at the Halfway Point

Week 20 is an emotional milestone. Many people experience a mix of pride, joy, and a little unease as the reality of the second half sets in. This is completely normal.

Common Feelings at Halfway

Pride at having come this far
Increased attachment to your baby, especially after the anatomy scan
Thoughts about birth and the postnatal period becoming more real
For some, a sense of missing the pre-pregnancy body
Nervousness about the results from the anatomy scan

Strategies for Good Mental Health

Share your feelings with your partner — open communication strengthens your relationship
Stay connected with friends and your social network
Regular physical activity is well documented to improve mental health
Mindfulness and meditation can help with worry
Consider a childbirth preparation class — it builds confidence and knowledge
Contact your midwife or doctor if you experience persistent sadness, anxiety, or sleep problems

According to ACOG and the NHS, you should always seek support from your healthcare provider if you experience symptoms of depression or anxiety during pregnancy. Safe and effective treatment is available.

Prenatal Appointments Going Forward

According to ACOG and the NHS, pregnant people typically have appointments around every four weeks in the second trimester. Here is what to expect:

At Each Appointment

Blood pressure and urine test (for protein and sugar)
Weight and fundal height measurement (uterus size)
Listening to your baby's heartbeat
Review of symptoms and questions

Upcoming Appointments

Week 24: Routine prenatal appointment
Week 28: Appointment with blood tests, glucose tolerance test for gestational diabetes
Week 32: Appointment, baby's position assessed

Use our pregnancy timeline and due date calculator to keep track of what is coming.

What Lies Ahead — The Road from Week 20 to Birth

You are halfway there, and it can be helpful to have an overview of what awaits in the second half:

The Third Trimester Begins (Week 28)

Your baby grows rapidly and starts laying down fat
The lungs mature and prepare for breathing air
You will feel clear and regular kicks
Tiredness may return as your body prepares for birth

Preparations to Make in Good Time

Weeks 20–24: Start planning the nursery and researching essential baby equipment
Weeks 24–28: Book a childbirth preparation class. Discuss parental leave with your employer
Weeks 28–32: Start packing your hospital bag. Think about your birth preferences
Weeks 32–36: Final appointments and preparations. Install the car seat
Weeks 36–40: Wait for your baby! Enjoy the last weeks as a couple or family

Key Appointments Ahead

Week 24: Routine prenatal appointment
Week 28: Blood tests, glucose tolerance test for gestational diabetes
Week 32: Baby's position assessed
Week 36: Check-up including GBS (group B streptococcus) test
Weeks 38–41: More frequent appointments

For Partners

Week 20 is a wonderful opportunity for partners to become more involved:

Attend the anatomy scan: See your baby and hear the heartbeat together — it is one of pregnancy's most special moments
Talk to the bump: Your baby can hear voices now, and deeper voices carry well through the abdominal wall
Exercise together: Go for walks — it is good for both of you
Cook nutritious meals: Share responsibility for a balanced diet with a focus on iron and calcium
Give massages: Ease back pain and sore feet with gentle massage

Tips for Week 20

Celebrate halfway: You have come halfway — it is worth marking. Take a bump photo to document the journey
Talk to your baby: Your baby can hear you clearly now. Singing, reading, and talking builds connection
Plan the nursery: Start thinking about furnishings and essential equipment
Enjoy the anatomy scan: If you have an appointment this week, it is a very special experience
Research parental leave: Start planning your leave with your employer and partner
Kegel exercises: Continue daily pelvic floor exercises — they prepare your body for birth
Create a wish list: Make a list of everything you need before the baby arrives

When to Contact Your Doctor

Contact your healthcare provider immediately if you experience:

Severe abdominal pain or cramps that do not resolve
Vaginal bleeding
Significant swelling in the face or hands (may indicate pre-eclampsia)
Persistent headache with visual disturbances
Fever above 38°C (100.4°F)
Watery discharge that may indicate amniotic fluid leaking
Burning or pain when urinating (may indicate a urinary tract infection)

Did You Know?

You are halfway!: Your baby has grown from a microscopic cell to a little human measuring around 25 cm and weighing 300–350 grams in just 20 weeks. In the next 20 weeks, your baby will more than triple in length and increase in weight to around 3–4 kg
Your baby has eyebrows: At week 20, the eyebrows are beginning to form. Your baby now has distinct facial features and already looks like a miniature version of themselves at birth
The uterus is the size of a melon: The uterus has grown from the size of a pear to reaching the navel. It now weighs around 350 grams — just the uterus alone — compared to 60 grams before pregnancy
Your baby has a favourite sleeping position: Even now, your baby has preferred positions to sleep in. You may notice that movements tend to come from particular areas of your bump
Vernix protects the skin: The whitish coating (vernix caseosa) covering your baby's skin acts as sunscreen, moisturiser, and antibacterial barrier all in one. It is made up of fats, proteins, and water

Frequently Asked Questions About Week 20

What happens during the anatomy scan?

The anatomy scan is a thorough examination where a sonographer checks your baby's heart, brain, kidneys, stomach, spine, arms, and legs. Placental position and amniotic fluid volume are also assessed. According to ACOG and the NHS, the scan typically takes 20–30 minutes and is a voluntary part of standard prenatal care. The vast majority of people receive completely reassuring results.

Is it normal not to feel kicks at week 20?

Yes, especially for first-time parents. Some feel the first movements as early as week 16, while others may not notice anything clearly until weeks 22–24. An anterior placenta (attached to the front wall of the uterus) can cushion movements and make them harder to feel. Speak with your midwife if you are concerned, but remember that there is a wide range of what is normal.

Should I start counting kicks now?

Systematic kick counting is generally not recommended until weeks 24–28, when movements are more regular and predictable. At week 20, the focus is on getting to know your baby's rhythm rather than counting. Over time you will naturally become aware of changes in activity. Contact your midwife if you have any concerns.

Can heartburn harm my baby?

No, heartburn is uncomfortable for you but completely harmless to your baby. It is caused by the uterus pressing on the stomach and the hormone progesterone relaxing the sphincter between the stomach and oesophagus. Eat smaller portions, avoid spicy and fatty food, and do not lie down straight after eating. Talk to your midwife about safe antacids if symptoms are very uncomfortable.

When should I start thinking about parental leave?

Week 20 is a good time to start planning. Parental leave rules vary significantly by country and employer, so it is worth doing your research now. Talk to your employer about your intended leave date, find out what you are entitled to, and start discussing with your partner how you would like to divide the time. The sooner you start planning, the better.

Is back pain normal at week 20?

Yes, back pain is very common during pregnancy and can begin from the second trimester. The growing bump shifts your centre of gravity, placing strain on the lower back. Good posture, regular exercise, Kegel exercises, and swimming can all help. Wear supportive shoes and avoid standing for long periods. Talk to your midwife about a referral to a physiotherapist if symptoms affect your daily life.

Congratulations on reaching halfway — you are doing a wonderful job!

Next week: Your baby continues to grow, and you are officially in the second half of pregnancy. Follow the pregnancy timeline to stay updated week by week.