Multiple-Partner Fertility in the United States: A Demographic Portrait.

Multiple-partner fertility (MPF) occurs when a person has biological children with more than one partner. The 2014 Survey of Income and Program Participation (SIPP), a nationally representative panel study of individuals and households in the United States, is the first such survey to include a direct question about whether respondents are MPF parents. Understanding the prevalence of such families is important given the known socioeconomic correlates of MPF and the ramifications of entering MPF for both individuals and families. In this study, the new SIPP data are used to generate key benchmarks for a national sample, present subpopulation estimates, and describe the sample of adults with children by multiple partners.