The primary aim of this proposal is to conduct a preliminary controlled trial of valproate and risperidone in children ages 3-7 yr. with bipolar disorders. A secondary aim is to carefully characterize these subjects using clinical rating scales and develop pilot data on a very young cohort of children with bipolar disorders that can be used to support an application to NIMH for a prospective, longitudinal study that will provide important information about the course, medication response, neurobiology and outcome of these patients.