A Guatemalan woman who gave birth to an American baby four days ago is being held along with her newborn as she faces deportation, U.S. officials said.

On Sunday, a U.S. Department of Homeland Security spokesperson said the woman was apprehended by Customs and Border Patrol agents and hospitalized after she crossed the U.S.-Mexico border illegally while eight months pregnant.

While hospitalized, she gave birth "under supervision," the spokesperson said. She was discharged by the medical staff and transferred to the custody of Immigration and Customs Enforcement as she awaits a court date, the spokesperson added.

In a separate statement Saturday, a CBP spokesperson said the woman "illegally crossed into the United States from Mexico between ports of entry near Tres Bellotas Ranch" in Arizona last week.

The location is on federal land just north of the the U.S.-Mexico border along a desolate stretch of the Sonoran Desert about 72 miles south-southwest of Tucson.

Following hospitalization, the CBP spokesperson said "processing" was completed and the unnamed mother was given a notice to appear before an immigration judge. Upon completion of this processing, the spokesperson said, she was given the opportunity to contact a lawyer.

"This morning, custody of the woman was transferred to ICE Enforcement and Removal Operations with a court date to appear before an immigration judge," the CBP spokesperson said Saturday. "The child remains with the mother."