A Harvard scientist followed ‘shy’ babies for 13 years. What he found is a goldmine for parents.

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• Harvard psychologist Jerome Kagan launched studies in the late 1970s following "high reactive" and "low reactive" infants, screened as young as four months for reactions to unfamiliar stimuli.
• Kagan found shyness stems from an overactive or hypersensitive nervous system, with visible differences in amygdala activity, and that it is often biologically based and inherited.