A live-in nanny slapped a 2-week-old baby in the face so hard the child’s parents could hear it downstairs in their Searingtown home, authorities said Saturday.

A Nassau County prosecutor described the alleged attack in court during the arraignment of the nanny, Stacy Sakeran, 57, of Jamaica, Queens.

Sakeran was arrested Friday after police said she was seen on a surveillance camera repeatedly slapping the baby girl in the face on two occasions in the past week.

The nanny pleaded not guilty in First District Court in Hempstead to two counts each of second-degree assault, a felony, and misdemeanor child endangerment.

Police said the baby’s parents were prompted to review the video after hearing the infant suddenly cry out about 1:40 a.m. Friday. The video showed Sakeran “forcefully moving the baby around and slapping her in the face numerous times,” according to police.

The parents then began reviewing earlier footage and found a clip from Tuesday showing Sakeran yelling at the infant and striking her several times with an open hand, police said.

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Sakeran was arrested at 4:10 a.m. Friday at the family’s home, police said.

When questioned by detectives, the nanny admitted to slapping the baby, police said in a criminal complaint.

Her bail was set Saturday at $50,000 bond or $25,000 cash. She was represented by a public defender who did not comment later. Sakeran’s family declined to comment outside the courtroom.

The baby’s parents said Friday night they believe Sakeran became upset while trying to feed the crying infant.

The father, Sibi John, said the baby appeared to be OK. John said he was relieved that the nanny’s alleged acts were caught early.

“We got lucky,” he said.

The owner of New York City-based Lullaby Services, which employs Sakeran, said she placed Sakeran on her baby nurse referral list two months ago after confirming her references. Sakeran also cleared a background check, Josephine Chrouch said.

Third Precinct detectives asked anyone who might have more information to call them at 516-573-6354.

With Newsday Staff