The development of stranger anxiety emerges at about 7 months of age, most likely because the infant's cognitive development has proceeded to the point where now the infant can tell the difference between a familiar adult and a stranger.

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This statement is true. Stranger anxiety typically emerges at around 7 months of age, which coincides with the infant's increasing ability to distinguish between familiar and unfamiliar people due to their cognitive development.

The Development of Stranger Anxiety Emerges at About 7 Months