Your Baby is the Size of a Tomato

Vernix develops

Your little one may have a cheesy varnish this week.

Say what? You read that right — a protective substance called vernix caseosa (vernix is the Latin word for "varnish"; caseosa means "cheese") now covers your fetus' skin. It's greasy, white, and made up of that downy hair known as lanugo, oil from your baby's glands and dead skin cells.

This waxy "cheese" may not sound too appealing, but it's there for good reason: Vernix protects your baby's sensitive skin from the surrounding amniotic fluid. Without it, he'd look very wrinkled at birth — sort of what you'd look like if you soaked in a bath for nine months.

The vernix sheds as delivery approaches, though some babies — especially those born early — will still be covered with it at birth, so you might get a look at your baby's first anti-wrinkle cream.

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Thanks for reading.