What is the thin white film on a baby's body at birth?

Patient's question:

What is the thin white film on a baby's body at birth?
Previous treatment and effectiveness: It disappeared after a while.
What kind of help do you want: What's going on?

Doctor's answer:

This layer is vernix caseosa, a normal phenomenon where babies are born with a thin, milky white oily substance and vernix on their skin. The amount of vernix covering different parts varies. It is composed of sebum secretions from the sebaceous glands and shed epidermal cells. While in the womb, vernix protects the fetus's skin from amniotic fluid. After birth, vernix not only provides skin protection but also helps maintain the baby's body temperature by spreading heat around if the environment is cold, ensuring a stable temperature. Generally, it will naturally metabolize within 1-2 days after birth.

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