The paramedics were able to restart the baby’s heart and he was taken to St. Vincent Healthcare.

“Personnel there at the hospital found ligature marks on his neck and a severe brain bleed,” Pierce said Monday. “It took the hospital about 24 hours to stabilize the child enough” to send him to Children’s Hospital Colorado.

House, the police lieutenant, went to St. Vincent during the investigation and saw Kayla Edwards in a waiting room, records say. He reported that she was talking on a cellphone and said, “it stopped breathing” — referring to her son.

Kayla Edwards initially denied abusing her son but later admitted to police that she hit the infant “really hard” on the back of the head and strangled him because he had been crying, according to prosecutors.

She also admitted to abusing both of her children in the past — and that she had left her son strapped into an upside down car seat for an hour on Dec. 23 or 24.

Brandon Edwards initially denied the abuse happened, but while being interviewed by detectives he broke down sobbing, records say.

He “admitted to watching Kayla Edwards strangle his son and hit his son on the back of the head, but he did nothing to intervene,” Pierce said.