For humans, the appeal of looking at faces starts before birth

Experiment is the first to test visual perception in fetuses

human fetus

FACIAL FIXATION  For the first time, scientists have peered inside the womb to watch how fetuses react to the sight of different images.

SciePro/Science Source

Fascination with faces is nature, not nurture, suggests a new study of third-trimester fetuses.

Scientists have long known that babies like looking at faces more than other objects.