A group of hero ex-cops pulled a woman holding a 5-month-old baby from the East River on Sunday after the lady walked into the water carrying the child, the former officers told The Post.

“We heard a lot of screaming, and somebody yelled, ‘You guys gotta get over there!’ ” said retired cop Kevin O’Donnell, who used to helm the Community Affairs Office at the NYPD’s 109th Precinct in Queens.

“She was walking straight out into the water.”

O’Donnell and pal Paul Pinsdorf, who served on the force for 20 years, said they were volunteering at the College Point Halloween parade in Hermon Macneil Park when the apparent near-tragedy occurred just before noon.

As the group of ex-officers rushed toward the water and O’Donnell called 911, the 30-year-old woman was with the baby and up to her chest in the water, O’Donnell said.

“I go, ‘Kevin, take my stuff — I gotta go in there,’ ” Pinsdorf recalled.

Pinsdorf said he noticed the baby’s head was almost under the water and had to rush to get both the woman and infant back to safety. 

“She resisted me, I had to go all the way out there and pull her in,” Pinsdorf said. 

O’Donnell described his buddy “eventually coming up from behind the woman, by then it was up to their neck in the water, both her and the baby she was holding, [and how Pinsdorf] grabbed them both.

“He’s a hero, he was the one that grabbed her and pulled her out,” O’Donnell said.

The ex-officer struggled to drag the woman to shore, and O’Donnell said there was a significant “language barrier” and that the woman caused a “commotion” as she got closer to land.

After EMS and the NYPD arrived, a group of first responders was able to further get the woman and the infant out of the water.

“I’m happy, I did a good thing today,” Pinsdorf said. 

The 30-year-old woman was transported to North Shore University Hospital, while the baby went to New York Presbyterian, according the the NYPD.

It’s unclear as of yet if the woman had given birth to the baby or what her intentions were, the department said.