Immigration Enforcement and Infant Health

The past two decades were characterized by an unprecedented increase in interior immigration enforcement and heightened stress due to fears of family separation and loss of income among undocumented immigrants. Using vital statistics on infant births from the National Center for Health Statistics for the 2003 through 2016 period and a difference-in-differences design, we compare the health outcomes of infants with likely undocumented mothers before and after the intensification of immigration enforcement within US counties. We find that intensified enforcement, especially during the third trimester, increases the likelihood of low birth weight (<2,500 grams). We also present suggestive evidence that the effect could be driven by heightened stress and fears associated with police-based enforcement during pregnancy. The findings underscore the importance of current immigration policies in shaping the birth outcomes of many American children.