• child support;
  • multiple partner fertility;
  • nonmarital fertility

The authors examined whether nonresident fathers provide informal support to their children and whether support stops if their ex-partner goes on to have a child with a new man. A logistic regression analysis of longitudinal survey and administrative data for 434 women who received welfare in Wisconsin showed that fathers are less likely to provide informal support when their ex-partner has a child with a new partner. Alternative models that control for unobserved characteristics suggest somewhat different results, providing stronger evidence of declines in support that can be shared across family members than in support that can be directed to a particular child.