This paper investigates the impact of international migration on child health outcomes in rural Mexico using a 1997 nationally representative demographic survey. To correct for the endogeneity of migration status, the authors use historic migration networks — 1920s, state-level migration rates in Mexico as instruments for current migration stocks. The authors find that children in migrant households have lower rates of infant mortality and higher birth-weights. One contribution of this study is that the authors also explore the channels through which migration may affect health outcomes and find evidence that migration raises health knowledge in addition to its direct effect on wealth. These results provide a broader view of the health consequences of migration than is offered by the existing literature.