Vernix: What the White Coating on Newborns Is and Why Not to Wipe It Off

Vernix, short for vernix caseosa, is the white, waxy coating that covers a baby’s skin in the womb and at birth, and current guidance is to leave it on and delay the first bath instead of wiping it off.

Newborns rarely look like the babies in photos. Many arrive streaked with a thick white cream, especially in the skin folds. That cream is vernix, and it has been protecting your baby’s skin for months.

This guide explains what it is made of, when it forms and thins, what studies suggest it does, what the World Health Organization (WHO) and the American Academy of Pediatrics (AAP) say about the first bath, and how to tell it from lanugo and meconium staining.

What Is Vernix? The Short Answer

The name is descriptive. A review in the Indian Journal of Dermatology (Singh and Archana, 2008) explains that “vernix” refers to varnish and “caseosa” to its cheesy nature. The same review notes that, according to present knowledge, vernix production is unique to humans.

Whether vernix stays on is mostly up to what the hospital does in the first hours, so it is worth a line in your third trimester birth plan.

What It Is Made Of

Vernix looks like a thick cream, and by weight it is mostly water. Singh and Archana report this breakdown:

The review describes vernix as shed skin cells mixed with sebum, the oily secretion of the baby’s sebaceous glands. It also reports that 41 proteins have been detected in vernix: 39% are components of innate immunity and 29% have direct antimicrobial properties. A separate clinical study (Visscher and colleagues, Journal of Perinatology, 2005) found vitamin E in vernix samples.

When It Forms and When It Thins

Mayo Clinic’s fetal development guide places the start at about week 19 of pregnancy, when “a greasy, cheeselike coating called vernix caseosa starts to cover your baby.” By week 21, Mayo Clinic says the baby is completely covered with fine, downy hair called lanugo, which helps hold the vernix on the skin.

Singh and Archana add that vernix develops from head to toe as the skin matures, and that the oil glands reach a peak of activity in the third trimester. Late in the second trimester and especially in the third, vernix starts to roll up and detach from the skin, which makes the amniotic fluid cloudier. For what amniotic fluid looks like when your water breaks, see signs of leaking amniotic fluid.

At birth, vernix may cover the entire skin surface or be confined to the body folds, the review notes. How much is left depends heavily on timing:

Gestational age is not the only factor. Singh and Archana report that, in the Visscher study, coverage was also higher in babies born by C-section and lower following meconium exposure.

If your baby arrives early and needs extra care, our NICU baby guide explains what to expect.

What It Does Before Birth

Vernix is what keeps skin from turning waterlogged after months in fluid.

• Waterproofing: Singh and Archana describe vernix as a hydrophobic (water-repelling) barrier against softening by amniotic fluid and against loss of fluids and electrolytes.
• Skin protection: Mayo Clinic says the coating helps protect a baby’s delicate skin from scrapes, chapping and hardening.
• Less friction at birth: the review says vernix acts as a protective film that minimizes friction during delivery.
• Possibly more: vernix that detaches is swallowed with the amniotic fluid. More than 20% of its amino acid content is glutamine, a known growth factor for the developing gut, so the review suggests potential effects there. That is a proposed role, not a proven one.

What It Does After Birth: What Studies Suggest

The main clinical data come from the Visscher study. Researchers recorded vernix distribution on 430 newborns, compared body temperature in 66 babies whose vernix was left on and 64 whose vernix was removed, and measured how leaving it on affected the skin.

• Moisture: skin hydration was significantly higher where vernix was retained.
• Acidity: skin pH was significantly lower with retention. Singh and Archana explain that an acidic skin surface is believed to inhibit harmful bacteria and help helpful ones settle in.
• Redness: erythema (redness) was significantly lower with retention.
• Warmth: retention had no effect on the babies’ underarm temperatures. The review agrees that vernix is not a primary factor in keeping a newborn warm.

The authors concluded that vernix is “a naturally occurring barrier cream” and supported leaving it on the skin at birth.

A fair reading: studies suggest vernix helps keep newborn skin hydrated and slightly more acidic. None of the sources we reviewed shows that leaving it on prevents infections or later skin conditions, so we are not claiming that. For warmth, the WHO guideline points to immediate drying, appropriate clothing and keeping mother and baby together.

Should You Wipe It Off?

In most cases, no. Singh and Archana cite a consensus statement that “removal of all vernix is not necessary for hygienic reasons,” and report that the WHO recommends leaving vernix intact on the skin surface after birth.

What usually removes it is routine cleaning. As Cleveland Clinic puts it, when the nurse cleans your baby to wipe away amniotic fluid and blood, the vernix goes with it. If you would like it left on:

• Tell your provider ahead of time and put it in your birth plan.
• Ask that blood and fluid be gently wiped but the white coating left alone.
• Ask to delay the first bath (next section).
• Skip the scrubbing at home too. Vernix tucked into skin folds can simply be left.

There is no rule that you must keep it. Staff may need to clean your baby for a medical reason, and preferring a bath sooner is a reasonable choice.

The Delayed First Bath: What WHO and the AAP Say

The WHO’s 2022 postnatal care guideline states: “The first bath of a term, healthy newborn should be delayed for at least 24 hours after birth.” The WHO rates the certainty of the evidence behind it as low.

On HealthyChildren.org, the AAP reports the same WHO advice and adds a fallback: wait at least 6 hours if a full day is not possible for cultural reasons. It notes that most institutions used to bathe babies within an hour or two of birth and that many are changing their policies. The reasons it gives:

• Body temperature and blood sugar: babies bathed right away may be more likely to become cold and develop hypothermia, and the minor stress of an early bath can make some babies more likely to have a drop in blood sugar.
• Bonding and breastfeeding: taking a baby away for a bath too soon can interrupt skin-to-skin care, bonding and early breastfeeding success. See how to breastfeed.
• Dry skin: vernix acts as a natural moisturizer and may have antibacterial properties.

An exception. The AAP says babies of mothers with HIV or the hepatitis viruses will still be bathed after the initial breastfeed, to decrease risk to hospital staff and family members.

At home, the AAP advises sponge baths only until the umbilical cord stump falls off, usually by about one or two weeks of age (see umbilical cord care). Three baths a week may be enough in the first year, since more can dry out the skin. Never leave a baby alone in the bath, even for an instant. For later, see baby bathtubs.

Vernix vs Lanugo vs Meconium Staining

What the Color Can Mean

• White or creamy: the usual look. The AAP calls vernix a waxy white substance.
• Golden yellow: Singh and Archana note that vernix color may reflect conditions in the womb, with a golden yellow color in post maturity or hemolytic disease of the newborn.
• Green, brown or yellow: the review says vernix may be stained by bile pigments in meconium when a baby has been under stress in the womb. Stanford Medicine Children’s Health lists green, brown or yellow coloring of the skin from meconium among the signs of a postmature baby.

Color is assessed in the delivery room, and your care team will tell you if it changes anything. Yellowing of the skin itself in the days after birth is a different issue. Tell your pediatrician promptly and read our baby jaundice guide.

Newborn Skin Care Once It Is Gone

Vernix does not last. Cleveland Clinic explains that the coating keeps the skin from shedding, so once it is gone, peeling follows.

• Peeling is expected: Cleveland Clinic says all newborns go through a peeling phase in the first two weeks, and babies born past their due date tend to peel more.
• Do not pick: let the skin fall off on its own, because it protects the new skin underneath (Cleveland Clinic).
• Moisturize simply: Cleveland Clinic suggests a petroleum-based moisturizer. The AAP suggests a fragrance free, hypoallergenic lotion right after a bath.
• Wash gently: use a soft washcloth or your hands without scrubbing (Cleveland Clinic). The AAP notes that soaps can dry out a baby’s skin.
• Expect common newborn spots: Seattle Children’s says more than 50 percent of babies get erythema toxicum, red blotches with a small white or yellow center that start on the second or third day of life.

Other common newborn marks have their own guides: stork bites, baby acne and, a few months on, teething rash.

Related Betteroo Guides

• Umbilical cord care
• Baby jaundice
• Stork bite birthmarks
• Third trimester guide
• Best baby bathtubs
• Baby acne

When to Call Your Pediatrician

Vernix itself is not a reason to call. These signs in a newborn are. Seattle Children’s advises calling your baby’s doctor or seeking care now if:

• Your baby is less than 1 month old and looks or acts abnormal in any way.
• Your baby is less than 12 weeks old and has a fever.
• You see purple or blood-colored spots or dots that were not present at birth.
• You see tiny blisters (little bumps that contain clear fluid), or water blisters or pimples grouped in a cluster. Seattle Children’s says a rash that looks like herpes needs a call right away because early treatment can prevent serious problems.

Call 911 if your newborn is not moving or is very weak, or you think there is a life-threatening emergency (Seattle Children’s).

Also call your pediatrician if:

• Your baby’s skin or the whites of the eyes look yellow. Do not wait on this one.
• Your baby has a mild rash and the cause is not clear (Seattle Children’s).
• Peeling lasts longer than three weeks, or the skin looks red, bloody or irritated (Cleveland Clinic).

This article is general education, not medical advice. Your delivery team and pediatrician know your baby and are the right people to decide when a bath or cleaning is needed.

Frequently Asked Questions

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