A 7-year-old boy was lucky to be alive Friday after tumbling three stories down the side of his East Harlem high-rise and landing on a 9th-floor ledge, cops and neighbors said.

The youngster made off with just a few minor injuries following the wild incident at the 14-story apartment building on East 131st Street near the Harlem River Drive, police said.

The boy was playing on a balcony on the 12th floor at around 11 a.m. when he went over and plunged down to the 9th floor — and screamed for help until neighbors came to his rescue.

“He said ‘I slipped,'” one woman told The Post.

“What happened was that my stepbrother ended up seeing him fall and he ran out on the terrace and grabbed him because he was hanging off the ledge,” witness Brianna McCall told WABC-TV.

“He could’ve died, so it was really intense, so when my stepbrother got him off of the ledge, he brought him back in and laid him down in the house,” she added.

The boy was taken to Metropolitan Hospital, where he was listed in stable condition, police said.