Increasing the probability of paying child support, in addition to increasing resources available for investment in children, also may alter the incentives faced by men to have children out of wedlock. We find that strengthening child support enforcement leads men to have fewer out-of-wedlock births and among those who do become fathers, to do so with more educated women and those with a higher propensity to invest in children. Thus, policies that compel men to pay child support may affect child outcomes through two pathways: an increase in financial resources and a birth selection process.