Why should vernix be left on a baby's skin at birth?

But why is my baby all white at birth? What's this white film on his skin? This substance is called vernix... Find out all about this protective shield that protects baby's skin in your belly.

What is vernix?
 

Vernix, or vernix caseosa, is a whitish, viscous substance that envelops the fetus in utero. It appears during the second part of pregnancy, around the 20th week, and is gradually eliminated in the amniotic fluid. However, a quantity of this waxy product remains on the baby's skin during and immediately after birth.

What exactly is the purpose of this vernix?
 

Vernix acts as a protective layer on the baby's skin, immersed in amniotic fluid, and is also of interest during the birthing process, when it acts as a lubricant. It is also said to have nourishing and protective properties for the skin of newborns covered with it at birth.

Should vernix be left on baby's skin after birth?
 

Babies are still coated with vernix when they give birth. It may be tempting to “clean” it for the sake of hygiene. However, the vernix will disappear on its own within a few days of birth, absorbed by the baby's skin.

With in particular to its multiple skin and thermal protection properties, midwives recommend leaving it in and, following the recommendations of the World Health Organization, they often advise postponing baby's first bath, particularly for premature births. In this way, the newborn can enjoy the benefits of vernix caceosa right up to the last moment.