The observation that a smaller number of infants are shy in contrast to the 40% of shy college students suggests that

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The observation suggests that adult shyness may reflect both inherited and learned influences, as it appears more prevalent in college students than in infants. This implies that while genetic factors may play a role in shyness, environmental and social factors likely contribute to its development in adulthood.

The Observation That a Smaller Number of Infants Are Shy