Sources told NY1 on Saturday night that a fourth infant was injured in Friday's attack at a Queens facility, suffering a skull fracture.

Police initially reported that Yu Fen Wang, 52, stabbed five people — including three newborn babies — and then slashed her wrist early Friday in a building on 161st St. in Flushing.

Sources said the injuries to the fourth baby, who was born less than three weeks ago, were discovered later.

Wang was already facing five counts of attempted murder. As of Saturday evening, officials had not confirmed if charges would be upgraded to reflect the discovery of the latest injury.

Authorities said Wang was being treated for her wounds and undergoing a psychiatric examination. The motive is under investigation.

Investigators were trying to piece together what happened inside the building, a three-story, multifamily townhouse in a neighborhood popular with Chinese immigrants in the Flushing section of Queens. Nine babies were there during the attack, and the place had at least 11 cribs, the district attorney's office said.

Officials said they believe the unlicensed facility may have been operating as a birthing center for women trying to gain American citizenship for their children. Local elected officials said it appears new mothers and their babies would convalesce there for a month, in keeping with Chinese tradition.

"This is every parent's worst nightmare imaginable," State Assemblyman Ron Kim said. He said it had apparently been operating for more than 10 years.

Police said Friday that they discovered a 3-day-old girl and a 1-month-old girl who had been stabbed in the abdomen, and a 20-day-old girl with cuts on her ear, chin, and lip. The father of one of the children and a woman who worked there were also stabbed, police said.

A butcher knife and meat cleaver were found at the scene.

The woman suspected in the attack was discovered bleeding and unconscious in the basement, and after officers applied a tourniquet, she regained consciousness and was taken to the hospital, police said.

"We pray that all of the victims will be fine and will survive these injuries," Queens District Attorney Richard Brown said. "We are hoping these young babies — small and so very fragile — are also strong enough to overcome this horrible act of senseless violence."

A Pampers box could be seen outside the building's front door. In the afternoon, a woman emerged from the house carrying a baby in her arms. She was driven away in a police vehicle.

State records indicate that a business called Mei Xin Care Inc. was registered at the address, but there was no listed phone number for that company.

The city health department said in a statement that it is investigating and confirmed there was no home day care license for the location.

Dr. Anderson Sungmin Yoon, who works at a nearby community center offering counseling services, came by on Friday to offer comfort to neighbors. He said there is often a stigma in the community about seeking counseling for psychological problems.

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Associated Press writers Stephen Groves and Jennifer Peltz contributed to this report.