WEEHAWKEN, N.J. (CBSNewYork/AP) — Prosecutors said an infant left on the steps of a Northern New Jersey high school has far more serious injuries than initially believed.

The 1-month-old girl was wearing only a diaper and wrapped in a blanket when a parent found her Friday at Weehawken High School. She was crying but appeared to only have a bump on her head.

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Hudson County Prosecutor Edward DeFazio, however, told The Jersey Journal of Jersey City the infant has multiple fractures — including a skull fracture — and is being treated at a Manhattan hospital.

Authorities believe the infant was only on the steps a few minutes. Her mother, a 37-year-old Weehawken resident whose name hasn’t been disclosed, was found by police and has undergone a psychiatric evaluation.

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She’s been questioned but not charged.

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