A mother in Washington state was arrested Monday for leaving her 3-month-old baby alone in a front yard — after the drugs she was on “made her paranoid,” cops said.

The woman, who has not been named, abandoned the boy sometime before 1:30 a.m., which is when authorities found him lying in the grass outside a random person’s home, according to police.

She told investigators that she was hopped up on drugs at a nearby residence — and scared for her life — when she made the decision to ditch the child.

“She said she grabbed her baby and ran from the residence because she thought she was being chased,” Lakewood Police officials said in a press release. “She admitted to leaving the baby in a front yard and hoping someone would find him.”

Cops said the boy — who was wearing a green-and-blue onesie with the words “little brother” on the front — didn’t appear to have been neglected or abused.

“In my 26 years I’ve never seen anybody leave a kid in the middle of somebody’s yard,” Lakewood Lt. Chris Lawler told the Seattle Times.

A woman who was walking in the area spotted him wriggling on the ground and initially thought he was an animal in distress. After further glance, though, she noticed he was an infant and quickly called police.

The boy was rushed to a hospital and eventually placed in the care of Child Protective Services.

At first, investigators weren’t sure where the child came from or who his parents were. It wasn’t until after his mother saw the local media coverage and identified herself that they were reportedly able to make an arrest.

The woman had been found running in the area a few hours after her baby was discovered, and taken to the hospital for treatment, cops said.

She has since been booked on suspicion of second-degree abandonment of a dependent person. The boy’s father, who was also not named, was taken into custody, as well, on a previously issued misdemeanor arrest warrant.