Jason Sharp, of Bellmore, was charged with assault, endangering the welfare of a child and criminal mischief.
He was arraigned Sunday and released on his own recognizance.
The judge issued an order of protection, barring Sharp from harassing his wife, his son and a 5-year-old child.
Newsday (http://bit.ly/YlxPtT ) says Sharp is an officer on the Brooklyn police gang unit.
The 3-year-old suffered swelling and bruising to the right eye, cheek and nose. The incident occurred Saturday afternoon.
Authorities say Sharp also punched a hole in the wall of the house while arguing with his wife.
He's due back in court on March 18. Information about his attorney wasn't immediately available.
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