Kumar was staying with one Soni Ramzan (21) at his Dabri residence, police said. Soni's husband, Ramzan, died a few days back after which she moved in with Sanjay.

"On Wednesday night, Sanjay went home in an inebriated condition and had a fight with Soni. Hearing noises, Soni's son, Sunny, woke up and started crying," a senior police officer said. In a fit of rage, Sanjay started beating up the child. He reportedly flung the child. Sunny became still and that was when Sanjay came in his senses, officers said. Police said Sanjay fled from the spot.

Soni called up the police. "By the time we reached, the child was dead. We have transferred him to the hospital for post-mortem," the officer said.