The change is to take effect in late May, according to people familiar with the planning, and should restore the right of migrants to request asylum once they cross the border into the United States.
People in the age group can get the additional shot at least four months after their first booster. Those 12 and older with certain immune deficiencies are also eligible.
Officials are bracing for the number of interceptions at the border to rise much higher if a public health order that has limited immigration during the pandemic is lifted.
The U.S. insurance and real estate industries have waged a decades-long campaign to avoid liability in lead cases, helping to prolong an epidemic. The cost for millions of children has been incalculable.