A Scandinavian study of 21,678 children looked into the links between drinking, smoking and social deprivation in pregnant mothers and symptoms of inattention and hyperactivity in their children. The researchers found that after adjusting for smoking and social deprivation prenatal alcohol exposure "was not related to risk for a high inattention-hyperactivity symptom score." However, maternal smoking and social adversity during pregnancy were "independently and consistently associated with an increase in risk of child symptoms."
Rodriguez, A. ... [et al] - Is prenatal alcohol exposure related to inattention and hyperactivity symptoms in children? Disentangling the effects of social adversity Journal of Child Psychology and Psychiatry September 2009, 50(9), 1073-1083