ForewordPrefaceTable of Contents1 The Demographic and Epidemological Context2 Month-of-Birth Patterns in the Northern and Southern Hemisphere3 Five Hypothesis4 Differences in Life Span by Month of Birth in the United States5 Month of Birth and Causes of Death in the United States6 Cohort and Age Effects7 The Month-of-Birth Patterns of Migrants and Farmers8 Does the Month-of-Birth Effect Exist in Cohorts Born Today?9 SummaryReferences