Formation

Sebaceous glands appear at the 20th week of gestation, and sweat glands appear somewhat later. Vernix caseosa—which is the secretion of the sebaceous glands mixed with exfoliated epidermal cells—is abundantly present, smearing the fetus’s skin.

Functions of Vernix Caseosa

1. Protection in the Womb: Provides a protective barrier for the fetus’s skin while in the amniotic fluid. This helps to regulate body temperature, prevent water loss, and offer some protection against infection.

2. Lubrication during Labor: Helps to ease the baby’s passage through the birth canal.

3. Natural Moisturizer: Keeps the baby’s skin moisturized and helps to prevent dryness after birth.

4. Skin Development: Plays a role in the development of the skin barrier function.

5. Anti-microbial Properties: Potentially helps to protect the newborn from infections.

6. Facilitate Skin-to-Skin Contact: Keeping it on after birth can promote bonding and allow for easier skin-to-skin contact.

When to Consider Leaving Vernix Caseosa On

Many parents are encouraged to allow the vernix caseosa to dry off naturally and shed on its own, rather than wiping it off immediately after birth. This allows the baby’s skin to absorb its protective benefits.