At what age do children show first fear when a new person enters their environment?

Question

Quizplus · Accepted Answer

By 6 months of age, infants become aware of and show fear and distress towards strangers. Before this age, they may show a preference for familiar faces but are not yet capable of demonstrating fear towards unfamiliar people. By 9 months of age, they may even exhibit stranger anxiety, which is a normal part of healthy development as they develop attachment to their primary caregivers.

At What Age Do Children Show First Fear When a New