A mentally disturbed woman allegedly drowned her four-month-old child in a roadside ditch in Bheramara upazila of Kushtia Wednesday.

The deceased was identified as Yaqub Ali, son of Mohan Ali of Chakmadia village. His mother has been arrested for the alleged crime, police said on Thursday.

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Locals told UNB that Akhi Khatun had on a number of occasions tried to kill the baby and that was the reason why the boy was being taken care of by his grandmother.

On Wednesday, Akhi brought the child home and later threw him in the ditch near her house. Locals informed the police after spotting the body floating in the ditch.

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On information, the police fished out the body and took the woman into custody.

Daulatpur Police Station OC (Investigation) Shafiq said Akhi had confessed the crime.