A neighbour - Parvin, 24 - killed the baby girl in retaliation of previous hostility with her mother, police said.
Md Harun-or-Rashid, deputy commissioner of Dhaka Metropolitan Police’s Tejgaon zone, made the disclosure at a press briefing at his office.
The baby - Sadia, daughter of Shahjahan and Murshida of the area - was murdered at her house around noon on July 3 when her mother was busy with cooking in the kitchen.
On information, Police went there and recovered the body. Later, the victim’s father filed a case at Adabar Police Station.
“After analysing the case, police suspected neighbour Parvina and arrested her on July 5,” said Harun-or-Rashid.
While quizzing her in remand, she confessed her involvement in the murder and described how she killed the baby girl with a blade.
Later, she gave a confessional statement before a court.
The police official said Parvin and the victim’s mother were at loggerhead over some trifling matters.
Finally, Parvin killed the baby to teach her a lesson, police said.