The woman, identified as Sushila Sanjay Taru, allegedly drowned her granddaughter in a barrel of water stored in the house in Undri area here yesterday, when the child's mother was inside the bathroom and her father was in another washroom.
A case of murder has been registered against the accused, police said.
"On Tuesday, the baby was left unattended in a cradle in the bedroom. Her mother was in bathroom whereas her father was in another washroom, and the suspect was having her breakfast. When the mother went to the bedroom, she did not see her baby in the cradle and they started searching for her in the house," Police Inspector Varsharani Patil, of Kondhwa police station, said.
"However, later the baby was found dead in the barrel of water in one of the rooms and the parents alerted the police control room," she said.
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Looking at the child's age, it was impossible for her to go to the barrel and it was clear that someone had put the baby in water, Patil said.
"During sustained investigation, the suspect spilled the beans and confessed to the crime. She told us that as the baby was ill since her birth, a lot of money was being spent and it was difficult to run the house as the family was debt-ridden," the inspector said.
A case under relevant sections has been registered against the accused, police added.