Uninsurance among citizen children with any noncitizen parents rose from 6.0 to 8.0 percent between 2016 and 2019. This increase reversed much of the coverage gains they had experienced between 2013 and 2016 and was larger than that for citizen children with only citizen parents. The Medicaid/Children's Health Insurance Program participation rate among eligible citizen children with noncitizen parents also fell from 93.1 to 90.8 percent between 2016 and 2019, likely contributing to these children's increase in uninsurance. These changes widened coverage gaps for citizen children with noncitizen parents relative to those with only citizen parents. They also align with findings that the proposed expansion of the "public charge" rule to include use of noncash benefits in applications for lawful permanent residence and other federal immigration policy shifts beginning in 2017 deterred some immigrant families from using public programs for fear of immigration-related consequences.