vernix caseosa

Full Definition

A white, creamy, cheese-like substance that covers and protects the fetal skin during intrauterine development. Vernix caseosa is composed of sebum, lanugo, and desquamated epithelial cells, and serves as a protective barrier against amniotic fluid and facilitates passage through the birth canal. The amount present at birth varies with gestational age - preterm infants typically have more vernix than term infants. Current practice often favors delaying initial bath to preserve vernix for its protective and moisturizing properties.

Usage

Usage note: Both words should be lowercase unless beginning a sentence. Latin origin - 'vernix' means varnish.

In Context

• "The term infant was born with minimal vernix caseosa on the skin folds." — Newborn examination notes
• "Hospital policy now recommends delaying the first bath to preserve vernix caseosa." — Nursing procedure update