Week 19: Vernix Is Forming

Your baby is now getting a white, waxy coating on the skin called vernix caseosa. This natural layer protects the delicate skin from the amniotic fluid and keeps it soft throughout the rest of pregnancy. Some babies still have remnants of vernix at birth.

You are nearly halfway through pregnancy! It is a milestone worth marking. Many find it feels more real now — the bump is visible, and you may be feeling the first kicks. This week is also the time for an important check: the anatomy scan.

Your baby now weighs about 240 grams and measures roughly 15 cm from crown to rump. The entire body is covered by the fine lanugo hair and the protective vernix layer that makes the skin waterproof.

Baby's Development

Size and Growth

Length: About 15 cm from crown to rump (about 24 cm head to heel)
Weight: About 240 grams
Comparison: The size of a mango

Key Developmental Milestones

Vernix caseosa: A white, fatty layer forms over the entire skin. It protects against the amniotic fluid, has antibacterial properties, and helps your baby through the birth canal
Unique fingerprints: The fingerprints are now fully developed — your baby already has a completely unique identity
Sensory development: All five senses are developing rapidly. The brain areas for sight, hearing, smell, taste, and touch are specialising
Sleep pattern: Your baby has clear sleep and wake periods, sleeping about 12–14 hours per day
Hair growing: Hair is beginning to grow on the head, and a fine layer of lanugo covers the body
Kidneys: The kidneys are producing urine, which is an important part of the amniotic fluid
Nervous system: Myelin — a protective layer around the nerves — is beginning to form
Coordination: Movements are becoming more coordinated — your baby can grip, stretch, and kick with precision

The Senses Are Developing in Order

At week 19, all five senses are actively developing, but they develop in a particular order:

Touch — the first sense, active from the first trimester
Taste — taste buds active, your baby can taste amniotic fluid
Smell — closely linked to taste, developing in parallel
Hearing — in the process of maturing, your baby perceives sounds
Sight — the last sense, not fully functional until after birth

The brain is establishing specialised areas for each sense. This process is called cortical specialisation and lays the foundation for how your baby will perceive the world after birth.

Vernix Caseosa — Nature's Protection

Vernix is composed of:

Dead skin cells (corneocytes)
Sebum from the sebaceous glands
Water (about 80%)

Its functions are many:

Protects the skin from becoming waterlogged by amniotic fluid
Has antibacterial properties, protecting against infections
Makes the skin softer and more elastic
Helps your baby slide through the birth canal
Provides moisture and warmth after birth

Research shows it may be beneficial to wait before washing off vernix after birth — it is absorbed into the skin and provides moisture in the first few days.

Your Body

Common Symptoms

Hip pain: The hormone relaxin loosens the joints in the pelvis to prepare for birth
Linea nigra: A dark line may appear from the navel down the abdomen
Dizziness: Blood pressure is often at its lowest around the middle of pregnancy
Drier skin: Hormonal changes can make the skin drier, especially on the abdomen
Nosebleeds: Increased blood volume and swollen membranes can lead to more frequent nosebleeds
Growing bump: The uterus is now roughly at the level of the navel

Pelvic Girdle Pain and What Helps

The hormone relaxin does not only loosen the ligaments in the pelvis — it affects all joints in the body. Pelvic girdle pain is a common complaint that affects up to 50% of all pregnant people to varying degrees, according to ACOG and the NHS.

Symptoms:

Pain in the hips, pelvis, and lower back
Stiffness at the start of movement
Pain when walking, especially on stairs
Aching that radiates down into the legs
Discomfort when turning in bed

Tips that help:

Avoid standing on one leg (sit down to put on shoes)
Take shorter steps when walking
Sleep with a pillow between your knees
A pelvic support belt can provide support and relief
Physiotherapy tailored for pregnant people can help significantly
Kegel exercises strengthen the muscles around the pelvis

Talk to your midwife about a referral to a physiotherapist if symptoms are affecting your daily life.

Good to Know

The Anatomy Scan (Weeks 17–19)

The anatomy scan is offered as part of standard prenatal care between weeks 17 and 20. This is the most thorough ultrasound examination during pregnancy. It is voluntary, but most people choose to have it.

During the scan, the following is checked:

Your baby's size and growth
That all organs are developing normally (heart, brain, kidneys, stomach)
Placental position
Amount of amniotic fluid
Number of fetuses
Any visible structural differences

Practical information:

The scan usually takes 20–30 minutes
You do not need to fast beforehand
A partly full bladder can help get a better image
You can choose whether to find out the sex
Bring your partner — it is a special experience

Let the sonographer know what you do and do not want to know.

Omega-3 and Brain Development

Omega-3 fatty acids, especially DHA, are important for your baby's brain and eye development. According to ACOG and WHO, pregnant people should eat oily fish like salmon and mackerel 2–3 times per week.

Good DHA sources:

Salmon (both farmed and wild)
Mackerel
Sardines
Trout
Algae-based omega-3 supplement

Important about supplements: Prefer supplements that provide DHA specifically (fish oil or algae-based). Avoid very high-dose vitamin A supplements, and choose products specifically formulated for pregnancy.

Childbirth Preparation Classes

Now is a good time to start thinking about childbirth preparation classes. Many hospitals, community health centres, and private providers offer classes for expectant parents.

Classes typically cover:

Birth preparation and the stages of labour
Breathing and relaxation techniques
Breastfeeding and newborn care
Your partner's role during birth
The postnatal period and the first time at home

It is also a great opportunity to meet other expectant parents in the same situation. Enrol early — classes can fill up.

Halfway There — Time to Celebrate!

You are nearly halfway through pregnancy! Many couples mark this milestone in a special way:

Take a pregnancy photo to document the journey
Write a letter to your baby about how you are feeling right now
Have a dinner with your partner and talk about dreams and plans
Start thinking about your birth plan

Nutrition at Week 19

In addition to omega-3, several nutrients are especially important now:

Iron:

Iron needs increase through pregnancy
Good sources: red meat, lentils, beans, spinach, whole grains
Vitamin C from fruit and vegetables helps absorption

Calcium:

Important for your baby's bone development
According to ACOG: around 1,000 mg daily
Good sources: milk, yoghurt, cheese, broccoli, almonds

Folate:

Continue with a folic acid supplement (400 micrograms daily)
Important for nervous system development

Vitamin D:

600 IU (15 micrograms) daily
According to ACOG, supplements are recommended for all pregnant people

For Partners

Help with heavy lifting and bending — her pelvis is under extra strain now
Suggest a quiet evening walk together — good for the body, sleep, and mood
Look into childbirth preparation classes in your area and sign up together
Come to the anatomy scan if possible — it is a special experience
Mark the halfway milestone together with something enjoyable

Tips for Week 19

Pregnancy pillow: Invest in a good pillow for side-sleeping — it makes a big difference to sleep quality
Kegel exercises: Start daily pelvic floor exercises — three sets of ten repetitions
Childbirth preparation class: Look into what is available where you live and sign up
Moisturise your skin: Use a good, fragrance-free moisturiser to counteract dry and itchy skin
Prepare for the anatomy scan: Write down any questions you want to ask
Omega-3: Make sure you get enough DHA through oily fish or a supplement
Pelvic support belt: Consider a support belt if you have pelvic girdle pain

When to Contact Your Doctor

Contact your doctor or midwife if you experience:

Watery discharge that may indicate amniotic fluid leaking
Constant abdominal pain or cramps that do not resolve
Bleeding or heavy spotting
Fever combined with pain
Sudden swelling in face or hands
Persistent dizziness or fainting
Intense itching, especially on hands and the soles of the feet

Did You Know?

Vernix caseosa is nature's skincare: The white, waxy layer covering your baby is made of dead skin cells and sebum. It protects the skin from the amniotic fluid and has antibacterial properties. Research shows it may be beneficial to wait before washing off vernix after birth.
Your baby may be dreaming: Research shows that fetuses have REM sleep (dreaming sleep) from around week 19. What they might be dreaming about remains a mystery — but brain activity is clearly present.
Fingerprints are unique: Your baby already has fingerprints that are completely unique. The patterns are formed by a combination of genetics and random events during fetal development — even identical twins have different fingerprints.
Your baby sleeps most of the day: The fetus sleeps up to 18–20 hours a day during this period. The short waking periods are filled with activity — kicking, stretching, and practising swallowing.
The kidneys are producing urine: Your baby's kidneys are active and producing urine, which becomes part of the amniotic fluid. Your baby swallows amniotic fluid and excretes it again — up to 800 ml per day towards the end of pregnancy.

Frequently Asked Questions About Week 19

What is relaxin, and why does it cause hip pain?

Relaxin is a hormone that loosens the ligaments in the pelvis to prepare the body for birth. Unfortunately it affects all joints in the body, which can cause pain in the hips, pelvis, and lower back. A pelvic support belt, gentle stretching, and swimming can provide relief. Talk to your midwife about a referral to a physiotherapist if the pain is troublesome. Adapted exercise can also help.

Should I enrol in a childbirth preparation class?

Childbirth preparation classes are especially recommended for first-time parents, but useful for everyone. Most hospitals and community health centres offer classes. You will learn about birth preparation, breathing techniques, breastfeeding, and newborn care. Most classes start in the third trimester, but it is wise to enrol early as they can fill up.

Is itchy skin on my abdomen normal?

Yes, itchy skin is very common and is caused by the skin stretching. Keep the skin well moisturised with fragrance-free moisturiser. Contact your doctor if the itching is intense and especially affects your hands and the soles of your feet — in rare cases this can indicate intrahepatic cholestasis of pregnancy, which should be investigated with a blood test.

How much omega-3 do I need?

According to ACOG and WHO, pregnant people should eat oily fish like salmon, mackerel, or sardines 2–3 times per week to get enough DHA. If you do not eat fish, a DHA supplement from algae or fish oil is a good alternative.

What happens during the anatomy scan?

The anatomy scan is a thorough examination where a sonographer checks your baby's organs, size, and development. They look at the heart, brain, kidneys, stomach, and other organs. Placental position and amniotic fluid volume are also checked. The scan usually takes 20–30 minutes. You can choose whether to find out the sex.

Can my baby notice the anatomy scan?

Ultrasound uses sound waves that your baby can probably perceive, but there is no reason for concern. The scan is safe and well documented. Your baby may respond to the pressure from the ultrasound probe with movements, which actually makes it easier to see the various body parts.

Next week: Congratulations — you are halfway! Week 20 is a major milestone with the anatomy scan and clear fetal movements.