Murli Patra, a daily wage labourer, slapped the baby girl yesterday when she did not stop crying despite all attempts to pacify her, Deputy Superintendent of Police B N Singh said.
The girl fainted after being slapped and she was immediately rushed to Tata Main Hospital where doctors declared her brought dead.
The victim's mother told police that Patra used to beat up the girl frequently, he said, adding that the father was arrested.