An en caul birth is a rare event where a baby is born still inside an intact amniotic sac. The sac balloons out at birth, with the child remaining inside of the unbroken or partially broken membrane.

A video from a Spanish hospital captures the moment a baby is born within the amniotic sac, an occurrence that only happens 1 in every 80,000 births. It is also known as a "caul birth" (the caul ...