This study has two key aims. The first is to confirm, in a large, diverse, longitudinal sample, the relationship between maternal anxiety and offspring anxiety. Second, we will explore the environmental factors that mediate (or moderate) this relationship, using a series of structural equation models. As an ancillary aim, (to be conducted as a master's degree project) we will explore positive outcomes of childhood anxiety. Hypotheses: Analysis 1: Longitudinal relationship between maternal anxiety, child anxiety, parenting and attachment. Analysis 2: Longitudinal relationship between maternal anxiety, child anxiety and temperament. Analysis 3: Early infant temperament, parental beliefs and susequent child Analysis 4: A model of child anxiety Ancillary hypothesis. There will be some positive benefit to experiencing clinical levels of anxiety. In particular, we hypothesis that highly anxious individuals will experience fewer accidents, and fewer injuries to bones and teeth.