Police were investigating the death of a 1-year-old girl on Staten Island whose parents had a history with the Administration for Children’s Services.

Little Bianca Abdul was found inside her playpen in the Midland Beach home on Moreland Street at about 8:05 a.m. on Monday, police said.

Though she had no outward signs of trauma to her body, Bianca was pronounced dead at Staten Island University North Hospital, according to cops.

Bianca’s mother admitted to investigators that the little girl had fallen and hit her head several days earlier, a police source said, but that she appeared to be fine and was never taken to the hospital.

But the family had a long history with ACS, stretching back several years, according to authorities. Authorities were called to the home several times, including in January 2015, April 2015, and March 2016 to investigate allegations of inadequate supervision and drug use, another source said.

The mother has an active order of protection against Bianca’s father, who has 14 prior arrests, including for a violation of an order of protection and third-degree assault, the source said.

The mother has two prior arrests, both of which are sealed.

“We are investigating this incident along with the NYPD. We await the medical examiner’s review,” an ACS spokesman said in an emailed statement.

A man reportedly identified as the baby’s father was handcuffed in front of the home on Tuesday, but it remains unclear why he was taken into custody, the Staten Island Advance reported.

Police said they are questioning members of the baby’s family, but so far no arrests have been made in the case.

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The city medical examiner will determine the cause of death.