The body of a baby found dead in the trunk of a car in Prince Frederick Thursday night was so badly decomposed that autopsy results might not be available until next month, authorities said.

Authorities responded to a trailer park in the 5400 block of Hallowing Point Road shortly after 6:30 p.m. Thursday, according to the Calvert County Sheriff’s Office. The parents of the car’s owner had opened up the car to clean it out. They found the body in the trunk and called police, authorities said.

It’s unclear how long the body had been in the trunk of the car. The vehicle’s owner, a 32-year-old mother of three, had left the car at the trailer park, where she had lived with her boyfriend and children, according to Lt. Steve Jones, commander of the sheriff’s office criminal investigations bureau. WJLA reported the woman had abandoned the car before voluntarily checking herself into a mental health facility more than a month ago. Jones said he could neither confirm nor deny that information because of patient confidentiality laws. It was unclear whether the woman intended to return to the trailer park, he said.

The body had been dead long enough that it was badly decomposed when police discovered it. That has thus far kept authorities from determining its gender or whether it was a newborn or a fetus. It may take until the middle of April for the medical examiner’s office to issue a final report on the cause of death and other details, authorities said.

Detectives have since interviewed the vehicle’s owner, authorities said. No charges had been filed in the case as of 5 p.m. Friday.

The parents of the vehicle’s owner have filed an emergency petition to take custody of her three children, Jones said.

Anyone with information is asked to call Detective Mike Mudd at 410-535-1600, ext. 2469, police said.