A man has been arrested for punching a six-months pregnant woman walking in Brooklyn yesterday. And video shows the attack was sudden, much like the so-called "knockout game" assaults.

According to the Post, Jannatul Ferdous, 34, was walking down a Bedford-Stuyvesant sidewalk with her sister at 3:45 p.m. yesterday when Willie Stephens, 33, "allegedly snuck up behind her and socked her in the head. Ferdous was knocked unconscious during the sudden attack, but neither she nor her child were critically injured." She was taken to Woodhull Hospital.

Her sister was able to call the cops and give a description, and police found Stephens and charged him with assault. Police sources tell the Post the incident appeared to be a "knockout game" attack, where victims are randomly targeted and then sucker-punched.

Earlier this week, a 72-year-old man was sucker-punched in the West Village. He's been in the hospital with bleeding of the brain and police are still looking for two suspect.