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Puerperal psychosis, an episode of mania or psychosis precipitated by childbirth, follows approximately one in 1,000 deliveries. The evidence of clinical, outcome, and genetic studies supports the hypothesis that the majority of puerperal psychotic episodes are manifestations of an affective disorder diathesis with a puerperal trigger. Family studies of puerperal psychosis consistently demonstrate familial aggregation of psychiatric (particularly affective) disorder and suggest a major overlap in the familial factors predisposing to puerperal psychosis and bipolar disorder. The single large study that used direct interview of relatives suggested that familial factors play a role in vulnerability to puerperal triggering itself. The authors’ goal was to test this hypothesis further. They conducted a study of the occurrence of episodes of puerperal psychosis in families multiply affected with bipolar disorder …