A preliminary inquiry by police has revealed that the woman, who belongs to Khammam district in Telangana, is unmarried. She joined the private hospital as a lab technician last week and was around six months' pregnant, they said.
"The hospital was not aware that she was pregnant," Inspector, Raidurgam police station, D Durga Prasad said.
On Sunday, she was on evening shift. At around 1.30 AM yesterday, some hospital workers heard the cries of a baby from a washroom in the premises.
A senior manager of the hospital and two other nurses reached the spot and through a gap in the washroom's door they saw the woman allegedly drowning the baby in the bucket of water, a police officer said.
The woman also had heavy bleeding following the delivery and was admitted in the same hospital for treatment, he said.
A case under of murder has been registered against the woman, he said, adding that she will be questioned.
Police said they suspect that the woman did not want to have the baby as she is unmarried.