A Research Note on the Stability of Coresidential Unions Formed Postconception

There is a large literature examining the stability of mid‐pregnancy unions, and parallel work on unions formed after a nonmarital birth, but research has yet to compare pre‐ and postbirth unions and simultaneously consider whether the union is with the father or a new partner. Using the National Longitudinal Survey of Youth, 1997 Cohort, the author compares the stability of coresidential unions (cohabitations and marriages) among three groups of mothers with nonunion first conceptions: those with a mid‐pregnancy union with the father (n = 203), those with a postbirth union with the father (n = 333), and those with a union with a new partner (n = 342). Compared to mid‐pregnancy unions with the father, postbirth father unions are 35% more likely to dissolve. New‐partner unions are more likely to dissolve than both types of father unions. These associations persist when accounting for union type and socioeconomic and demographic characteristics.