Washington (CNN) At least 18 migrant infants and toddlers under the age of two were separated from their parents at the border "including nine infants under the age of one," according to a report released Friday by the House Oversight Committee.

The Trump administration's "zero tolerance" policy announced in April 2018 led to the separation of thousands of families, sparking a national outcry. More than a year later, the repercussions of that policy continue to be felt as House Democrats seek additional information on its execution.

The Democratic-led House Oversight Committee report comes ahead of a hearing on child separations that will include testimony from Reps. Alexandria Ocasio-Cortez and Rashida Tlaib, who toured border facilities last week, as well as testimony from the inspectors general from the Department of Health and Human Services and Department of Homeland Security.

Friday's report, based on data obtained by the committee under subpoena from the Trump administration, provides new information about at least 2,648 children who were separated from their parents.

The findings include:

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