The incident occurred in China's Guangxi Zhuang autonomous region, reported Xinhua.
The boy died in hospital, police said.
Police said they received a call Friday saying that a child has fallen from a building.
Police later linked the incident to a man surnamed Lu, who confessed that he threw the child off the building because of a "romantic dispute" with the kid's mother.
The child had no biological connection with the suspect.
Lu is in police detention.
--IANS (Posted on 21-09-2013)