Officials say Ann Zheng was looking after the boy at Dearest Angel Child Care on March 28.
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Investigators from the Bergen County Prosecutor's office and Palisades Park police department found Zheng assumed responsibility of the child and neglected him, which caused the child to suffer serious injuries.
Zheng has since been charged with second-degree endangering the welfare of a child and is being held at the Bergen County jail for her first appearance in front of a judge.
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It was not yet clear how old the child was or the circumstances of the injury.
Few other details were released.
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