Behavior: A Child's Second Birth

At 18 months, Baby knows Mother is separate

Some of life's greatest turmoil is over by the age of three. Though infancy may seem to be a time of games and gurgling, the baby is caught up in earnest and sometimes desperate attempts to make sense of the world, control aggression, and come to terms with the awesome power of parents. In a remarkable new book, Oneness and Separateness, Psychologist Louise Kaplan, 48, offers a baby's-eye view of the child's struggle to become an individual. Behind that struggle, says Kaplan, are opposing needs of...

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