“A gory, bloody, massacre mess.”

That’s what horrified New Mexico hospital staff say they encountered when they entered an emergency department bathroom just moments after police say teenager Alexee Trevizo gave birth and dumped her newborn in a trash can.

In a series of interviews with investigators, Artesia General Hospital nurses and cleaners gave harrowing and grim accounts of the moment they discovered the dead baby boy on Jan. 27 — including how the umbilical cord “looked like an animal had torn it apart.”

The 19-year-old, who insists she didn’t know she was pregnant when she checked into the hospital with back pain, was slapped with murder and tampering with evidence charges last month after allegedly confessing to giving birth, hiding her baby in the trash and then trying to wipe up the blood.

“There was blood everywhere – on the floor, wall,” hospital cleaner, Dia Lewis, told cops in a taped April 25 interview, which was obtained by The Post.

Lewis, who described the scene as a “gory, bloody, massacre mess,” had been called in to help mop up after nurses suspected the teenager had suffered a miscarriage in the bathroom.

Moments earlier, Trevizo was captured on surveillance video running to the bathroom clutching her bum before locking herself inside.

Nurses recalled hearing repeated flushing and use of the paper towel dispenser before they eventually ordered her to come out.

Soon after getting to work wiping down the walls and toilet, Lewis told cops she found the baby’s body when she lifted up the trash can and realized there was “some weight” there.

She said she pulled out the liner of the trash can only to find the boy, wrapped in another clear plastic bag, stashed at the bottom.

“After I picked up the trash bag at the top to change it, that’s when I seen the baby,” she told police.

“He had hair and, um, he was like purple-ish. He wasn’t bruised or nothing like that. He was purple, pink-like skin color.”

A nursing assistant, only identified as Lori, said that’s when the sickened cleaner called out for her help.

“It was a clear bag… All I saw was black and purple but when we picked it up that’s when it suctioned to his face,” Lori told investigators.

After the baby’s body was rushed into a trauma room, Lori said she took note of the boy’s umbilical cord.

“I noticed the umbilical cord looked like an animal had torn it apart,” she said.

“Like, have you ever eaten string cheese? When you twist it? That’s how the bottom of the umbilical cord looked. 

“It caught my eye and I was like ‘God, this chick really ripped this thing apart’ because those things are hard to cut.”

Asked if the amount of blood found in the bathroom was consistent with having given birth, Lori said: “To me, it looked like she had given blood in there and she was trying to clean it up.”

“This blood was fresh, you could even smell it,” she continued. “I’ve dealt with death before but never like this. It was horrible.”

Triage nurse Chris Sanchez, who was the one who ordered Trevizo to leave the bathroom, told cops that the teenager had told him she was “on her period.”

“At this point we had already received the positive pregnancy lab test,” Sanchez said, adding that the doctor hadn’t yet informed the teen of the results.

“I saw the baby in the trash can … It was just laying at the base of the trash can under the liner,” he continued.

“It did not look alive.”

Trevizo later copped to giving birth in the bathroom after being questioned in her hospital bed, previously released police body cam video shows.

“I’m sorry. It came out of me and I didn’t know what to do,” Trevizo said immediately after a doctor told her and her mom they’d found the newborn’s body.

“Lexee I told you about this! I just asked you baby to tell me the truth!” her distraught mother responded.

“I was scared,” Trevizo said before telling the nurse that “it was not crying or nothing.”

Despite her positive pregnancy test, Trevizo allegedly denied to hospital staff that she had ever had sex.

The New Mexico Office of the Medical Investigator later determined newborn died by homicide.

Trevizo is charged with first-degree murder, or alternatively abusing a child resulting in death, and tampering with evidence.

She was released from jail and permitted to finish the school year without an ankle monitor or house arrest as she awaits trial.