Vernix Caseosa: What It Is, Benefits And Risks For Baby

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Vernix caseosa, often known as vernix, is a white, waxy, creamy, or cheesy material that coats the skin of newborns. Vernix comprises the sebaceous gland and periderm cells (which cover the developing skin cells) that are shed around the 21st week of pregnancy. It protects the fetus during development as well as after birth.

Vernix may not be present on the skin of extremely premature newborns or those with very low birth weight. Further, babies born between 32 and 37 weeks of pregnancy may have more vernix than full-term neonates.

Read this article to learn about the benefits and risks of leaving vernix caseosa on a baby’s skin after delivery.

Purpose Of The Vernix Caseosa

Babies can benefit from vernix caseosa beyond pregnancy. Even little vernix caseosa on a baby’s skin can be beneficial during and after delivery. These benefits could include the following (1).

  • Antimicrobial properties of vernix caseosa help the baby avoid infections that they may contract through the skin during and after delivery
  • Waterproof the fetal skin from the fluid in the womb
  • Lubricate the birth canal to reduce friction during vaginal delivery
  • Moisturize the skin and prevent dryness and cracking
  • Enhance the healing of skin wounds, if any, at birth
  • Provide the newborn’s skin with antioxidant properties

Besides these benefits, vernix also has certain clinical significance. It may help doctors diagnose uterine rupture, amniotic fluid embolism, and determine the exposure of drugs in pregnant women.

Vernix caseosa is a natural protector of a baby’s skin. Letting it be on the baby’s skin for a longer time, that is, delaying the first bath, may reduce the need for various protective skincare products, such as moisturizers and other protective creams for newborns.

How Long Should The Vernix Stay On A Baby’s Skin?

WHO recommends leaving the vernix intact on the skin after birth. The beneficial effects of vernix are only obtained if allowed to stay on the baby’s skin for a few hours after birth.

Recent evidence suggests that wiping off vernix for hygiene purposes, drying, or stimulating the respiratory effects may not be necessary for all babies.

Should You Delay Your Baby’s First Bath?

Delaying the first bath may help the baby reap all the benefits of vernix caseosa (2). There is no recommended time to give a bath to obtain complete benefits. However, delaying the first bath for a few hours could be beneficial.

Some mothers may not give baths to their baby for a few days to a week after birth. It is not necessary to delay bathing for several days. It is essential to remove amniotic fluid and blood from babies’ skin for hygiene purposes. You may ask the hospital staff to gently clean the baby, leaving some of the vernix on their skin. You may massage the vernix into the baby’s skin for a few days after birth.

Delaying the first bath may not be ideal for babies born with meconium (first stool) contaminated amniotic fluid or with the risk of contracting infections from the birth canal. You may discuss with the healthcare provider to know the best time and method to bathe your baby.

Risks of Leaving Vernix On A Baby’s Skin After Birth

Leaving vernix on a newborn’s skin may not cause any risk in most cases. Babies with meconium staining or a history of chorioamnionitis may have an increased risk of developing bacterial overgrowth if the vernix is left on the skin for several hours. In some cases, leaving vernix may increase the risk of contracting maternal infections, such as hepatitis and HIV.

Excess vernix on the baby’s skin may result in neonatal aspiration syndrome. In rare cases, vernix caseosa may lead to granuloma and peritonitis (heart infection) in babies born through cesarean sections (1). The risk may vary depending on the existing health conditions, so you may take the appropriate decision according to the risks and benefits of leaving vernix on the baby’s skin.

Frequently Asked Questions

1. Does vernix make the baby cold?

No, the vernix caseosa helps keep the baby warm and reduces their risk of contracting conditions such as jaundice and experiencing weight loss (3).

2. Why did my baby have so much vernix?

The amount of vernix on preterm and late preterm babies is often different. Very little or no vernix is found on preterm babies because vernix develops in the latter part of the pregnancy. On the other hand, late preterm babies are covered in more vernix because they do not get the chance to shed in the uterus before the delivery (4).

Vernix caseosa is a naturally protective layer on a newborn’s skin. Usually, immediate bathing is not required for all babies, and if there are no such factors to delay the first bath, you may wait several hours to let your baby benefit from the vernix and soak its moisture. However, you must discuss it in detail with a healthcare professional to ensure that you know all the risks and benefits of leaving the vernix caseosa on your baby’s skin for a more extended period.

Key Pointers

  • Vernix caseosa has natural antimicrobial and antioxidant properties to protect a baby’s skin.
  • You can delay the baby’s first bath as keeping the vernix intact on the baby’s skin after delivery is recommended.
  • Too much vernix on the baby’s skin might induce newborn aspiration syndrome.

References:

MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
1. Unraveling the mystery of vernix caseosa; US National Library of Medicine
2. Delayed Bathing; International Childbirth Education Association (ICEA)
3. Newborn care in the delivery room; March of Dimes
4. Differences Between Term and Preterm Newborns; Lancaster General Health
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Dr. Elna Gibson

(MBChB, MMed, Paeds)
Dr. Elna Gibson is a general pediatrician. She did her MBChB and specialization as a pediatrician in South Africa at the University of Pretoria. She obtained MMed Pediatrics (masters) with distinction in 1993. As a young specialist, Dr. Gibson spent some time in the Netherlands, and then settled in the Vaal Triangle where she has practiced for 25 years. She... more

Dr Bisny T. Joseph

Dr. Bisny T. Joseph is a Georgian Board-certified physician. She has completed her professional graduate degree as a medical doctor from Tbilisi State Medical University, Georgia. She has 3+ years of experience in various sectors of medical affairs as a physician, medical reviewer, medical writer, health coach, and Q&A expert. Her interest in digital medical education and patient education made... more

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