Her third child, 2-year-old Ayesha, is battling for life at the MGM Hospital here.
Masiya Begam had married Ansar Alam around eight years ago and they were apparently living happily, Bahadurganj police station SHO Mahfooz Alam said.
But their relations soured ever since she came to know that her husband had married another girl in a neighbouring village a few days ago, the SHO said.
"Ansar and his second wife have been detained for interrogation," the SHO said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)