The proliferation of poor immigrant children in the United States raises co
ncern about their high uninsurance rates and access to care. We examined th
e joint effects of health insurance status and place of birth on use of hea
lth services by children of the working poor. Of foreign-born children, 52
percent were uninsured and 66 percent had a regular care source, compared w
ith 20 percent and 92 percent, respectively, of native-born children. Forei
gn-born uninsured children were less likely than their native-born peers we
re to have a regular care source or to have sought care. Health insurance a
nd immigration policies must act in concert to increase health care access
for foreign-born children.