What is the common age for a child to start expressing fear of strangers?

Children typically start to express fear of strangers between the ages of 6 to 9 months. This developmental milestone is part of a larger stage known as "stranger anxiety," which usually emerges as the infant's cognitive and emotional development progresses. Around this age, infants become more aware of their surroundings and begin to differentiate between familiar caregivers and unfamiliar individuals.

As they form attachments to their primary caregivers, the presence of unknown people may elicit anxiety or distress, reflecting their growing awareness of social relationships and attachment bonds. This behavior serves a protective function, as it encourages infants to remain close to familiar caregivers who can ensure their safety. By recognizing the common timeframe of 6 to 9 months for the onset of stranger anxiety, caregivers and professionals can better understand child development and provide appropriate support during this phase.

The other age ranges mentioned, while related to other developmental aspects, do not align with the typical timeline for the onset of fear of strangers.