A newborn baby was found dead in the bathroom of a lower Manhattan restaurant Monday morning, police said. Police responded to the scene, Sophie’s Cuban Cuisine on Fulton St. near Gold St. in the Financial District, after getting a 911 call at 9:56 a.m. The restaurant doesn’t open until 10:30 a.m. and cops were trying to determine if the baby was left there Sunday night or if someone used the bathroom Monday morning. It wasn’t immediately clear if the baby was born alive or the victim of a crime. The city Medical Examiner will conduct an autopsy to determine how the baby died.