Researchers learned that highly irritable newborns were most sociable at ages 18 to 24 months if they had a secure attachment to their mothers, while those with an insecure attachment were the least sociable. Highly irritable newborns with insecure attachment also explored the least as toddlers, according to data in the journal Child Development. Researchers didn't find a link between attachment style and sociability or exploration among toddlers who were moderately irritable as newborns.

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