 Overall, undocumented immigrants are likely to be uninsured due to lack of employer-sponsored insurance and ineligibility for Medicare, Medicaid, CHIP, and PPACA Marketplaces.Health benefits are largely contingent on immigrant parents in that although a child may be born in the U.S., the naturalization process for adults can take between 5 and 10 years.Since welfare reform initiatives like the Personal Responsibility and Work Opportunity Reconciliation Act have been enacted, states have seen an overall decline in the number of children being vaccinated.