In the movies, babies seem to emerge from the womb looking pink and squeaky clean…but the reality is sometimes a little bit messier. Many babies enter the world with bits of a thick, white substance, known as vernix caseosa, covering their skin or hiding in their deep folds.  

This name is Latin, vernix meaning “varnish” and caseosa meaning “cheesy.” In the last few months of pregnancy, babies have vernix slathered in their bodies like cream cheese on a bagel. Then, it gradually disappears as your due date approaches. So, you can see lots of it on a preemie, but full-term babies usually just have little bits hidden in the folds of the neck behind the ear, armpit, labia, under the foreskin, etc.

What is vernix?

Vernix is a protective coating that forms on baby’s skin in utero. It is a thick, greasy substance made of water, fatty acids, and proteins, and it creates a moisturizing barrier for your baby’s skin. After all, being surrounded by amniotic fluid is a little like living in a swimming pool! The vernix protects and hydrates Baby’s delicate skin so that it does not chap or wrinkle.

Why is vernix important?

But vernix is more than just a moisturizer—it plays many important roles during gestation, birth and even afterwards. A bit of it globs into the ear canal, too, and may even protect the baby from loud noises. (One more interesting fact about vernix—only humans and sea lions make it!)

Vernix benefits for Baby:

  • Vernix helps develop baby’s healthy gut bacteria. Your little fetus is swallowing bits of vernix every day. This helps develop the baby’s good gut bacteria and prevents infection.
  • Vernix helps fight off bad bacteria. Newborns have pretty weak immune systems, which makes them more susceptible to illnesses, like skin infections. Vernix keeps the skin a little more acidic, which helps slow the growth of bad bacteria.
  • Vernix helps keep babies warmer. Of course, you’ll wrap your baby in blankets and keep a comfortable room temperature, but vernix also helps keep babies warm by reducing evaporation of water through the skin, which can cool the baby too much.
  • Vernix moisturizes a baby’s skin. Vernix is the richest skin cream…ever. It contributes to the unbelievably smooth and delicious skin babies have at birth.

Should you leave vernix on a baby or wash it off?

Though your first impulse may be to clean this goop off ASAP, many parents instead rub the vernix into the skin and hold off the first sponge bath for a few hours (up to a day) to let the vernix continue its important job. In fact, the World Health Organization recommends leaving the vernix on the skin for at least 6 hours and preferably 24 hours to give your baby its full benefit.

After a day or so, the vernix often starts to get a little smelly and you will want to do a little soapy sponge bath to clean off any bacteria starting to collect on your little baby’s delicate skin. You may need to use a moistened cotton swab to remove the thicker layer of vernix deposited deep in your baby’s skin folds. Don’t stress over getting it all out right away…it often takes three to five days to remove it, bit by bit.

When to wash vernix right away:

There is one case in which vernix should be washed off right away, and that’s if it has become mixed with meconium, aka Baby’s first poop. In that event, it may be safer to wash away the vernix to prevent baby from getting it on the hands and eating the meconium.

Final thoughts on Vernix

So, while your little one won’t arrive as camera-ready as those babies in the movies, you can rest assured that the yucky-looking stuff coating their skin actually serves a pretty sweet purpose.

About Dr. Harvey Karp

Dr. Harvey Karp, one of America’s most trusted pediatricians, is the founder of Happiest Baby and the inventor of the groundbreaking SNOO Smart Sleeper. After years of treating patients in Los Angeles, Dr. Karp vaulted to global prominence with the release of the bestselling Happiest Baby on the Block and Happiest Toddler on the Block. His celebrated books and videos have since become standard pediatric practice, translated into more than 20 languages and have helped millions of parents. Dr. Karp’s landmark methods, including the 5 S’s for soothing babies, guide parents to understand and nurture their children and relieve stressful issues, like new-parent exhaustion, infant crying, and toddler tantrums.

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Disclaimer: The information on our site is NOT medical advice for any specific person or condition. It is only meant as general information. If you have any medical questions and concerns about your child or yourself, please contact your health provider.