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As any parent knows, babies aren't born with a fear of heights. Infants can be frighteningly bold around the edge of a bed or a changing table. New research shows infants may build an avoidance of heights once they get more experience crawling.
A video of a blue ball 'bullying' a yellow cube used in a study which found that babies prefer the victims of such interactions, suggesting that sympathy develops at as young as 10 months of age.