A police official said the grandson of the legislators was born to their son Abhishek alias Raja Babu and his wife Khushi yesterday at the hospital located in the heart of the city.
Muzaffarpur Senior Superintendent of Police (SSP) Ranjit Kumar Mishra visited the spot and is reviewing the incident.
"We reviewed CCTV footage of the hospital and noticed the two women coming there and later escaped with the child. We are trying to trace them. We have also arrested two private guards - Ajay Kumar Rai and Kumar Rakesh - posted at the entrance of the hospital. They are being interrogated," the SSP said today.
The mother of the infant woke up in the evening and noticed the absence of the child. She raised an alarm after which the hospital staff, her husband and the her in-laws rushed there, the official said.
The police is carrying out raids to locate the two women. It is also preparing to circulate their photographs in the district and sought help of the public in identifying them.