Using recently released data from the 2002 National Survey of Family Growth, this Research Brief presents a portrait of multiple-partner fertility among men aged 15-44 living in the United States. The brief also examines the types of relationships within which multiple-partner fertility occurs and the links between the characteristics of fathers and multiple-partner fertility. The results of Child Trends’ analyses both support the findings of previous research and provide new information. For example, we found that multiple-partner fertility was more prevalent among certain groups: older men, African-American men (compared with white men and Hispanic men), and men who grew up in households that were not headed by two biological parents. We also found that men were more likely to have children with multiple partners if they had their first sexual experience at a young age, if they fathered their first child at a young age, and if they were neither married to nor cohabiting with the mother of their first child at the time of the child’s birth. In addition, we found that multiple-partner fertility often occurred in conjunction with problem behaviors, including incarceration and drug use. Also, our analyses showed that although most fathers with multiple-partner fertility had children with just two partners, men who fathered children with more than one woman had more children, on average, than did fathers of two or more children with the same mother. (Author abstract)