This research is a prospective follow-up on an existing cohort of women and their children to determine whether dietary intakes of docosahexaenoic acid (DHA) during pregnancy have effects lasting into early childhood. The purpose of this study is to assess the relationship between maternal DHA status in gestation, which is known, and the child 's own diet and relevant genetic variables on the child's neural, cognitive and behavioral development. Hypotheses: 1. maternal DHA status in gestation has a lasting effect on infant development evident when assessed in early childhood 2. Children with low DHA status will be at increased risk for poor scores on tests of development. 3. Genetic variation in fatty acid metabolism will influence blood fatty acids in preschool children.