The 8-month-old baby who plunged from a 15th-floor Bronx balcony in her mother’s arms after the pair were allegedly pushed by the child’s father has deteriorated and is now in dire condition at a hospital, The Post has learned.

“They are keeping their fingers crossed,” a hospital insider told The Post about the infant’s condition. “She is not doing well.”

Angel Novalty Carrasco-Ramirez was initially taken to Jacobi Hospital after miraculously surviving the fall that killed her 23-year-old mother, Nathaly Ramirez, on Tuesday. The infant was later transferred to Cohen Children’s Medical Center in Queens.

Ramirez’s former boyfriend and Angel Novalty’s father, 31-year-old Angel Carrasco, fled the scene before being arrested Wednesday by US Marshals and NYPD officers.

Carrasco was taken to Jacobi Hospital for a medical evaluation following the alleged attack. He faces murder and attempted murder charges, and his arraignment is pending.

Mourners gathered Saturday for a vigil outside the Bronx building where Ramirez and her baby were allegedly pushed from the balcony.

About 200 people attended the memorial, which featured purple and white balloons as well as heart-shaped candles. The vigil was sponsored by We All Really Matter, or WARM, an organization that helps pay funeral expenses for domestic violence victims.

Those gathered chanted, “Justice for Nathaly” and “Long live Nathaly.”

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Ramirez’s devastated mother, who identified herself as Nathaly, thanked the crowd for attending and spoke about how her daughter had helped both “mistreated women, and men.”

“She loved honestly,” the grieving mother and grandmother told the crowd. “She hugged with a tenderness that only had peace.”

Photos honoring other domestic violence victims, including Lovay Williams, were displayed nearby.

Williams was found beaten to death inside her apartment on West 156th Street in Manhattan’s Washington Heights neighborhood on Sept. 6. Tiliek Shamel Thompson, 41, was charged with murder, strangulation, assault and child abandonment in connection with her death. He has pleaded not guilty to the charges.

Brianna Rios, a domestic violence survivor whom Ramirez had once consoled, addressed the crowd about Ramirez’s troubled relationship with Carrasco.

“Natalie, unfortunately, is being added onto this very long list of beautiful faces and names,” Rios said.

Rios urged officials and the public to push for changes in how domestic violence cases are handled, particularly when it comes to “protecting family, children, and these beautiful women.”

“The police were called to Nathaly’s home over five times,” the 24-year-old said. “The killer of Nathaly Ramirez was arrested two times — once for slapping her, the second time for breaking and entering into her home. Not only was he able to get next to her again, he was able to kill her.”