_______ is a pervasive developmental disorder that involves an arrest of brain development during infancy.

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Rett's disorder is a pervasive developmental disorder characterized by normal early growth followed by a slowing of development, loss of purposeful use of the hands, distinctive hand movements, slowed brain and head growth, problems with walking, seizures, and intellectual disability. It primarily affects girls and involves an arrest of brain development during infancy.

_______ Is a Pervasive Developmental Disorder That Involves an Arrest