Six people were burnt in a fire at a house in the Baghpara area of Siddhirganj upazila in Narayanganj on Wednesday night.
The injured were Sukhi Akhtar, 32, her daughter Sadiya, 10, sister Jannati Akhtar, 18, brother Arif Haoladar, 21, Rahima, and her daughter Ritu, 13.
All of them are currently receiving treatment at the Sheikh Hasina National Institute of Burn and Plastic Surgery.
Dhaka Medical College and Hospital (DMCH) police outpost in-charge Inspector Bachchu Mia confirmed the matter.
Among the injured, Rahima has sustained over 45% burns and is undergoing treatment at the intensive care unit (ICU), said resident physician Dr Tarikul Islam.
Sukhi lives with her husband, Nur Mohammad, in the Baghpara area, according to Rony Haoladar, a relative.
She gave birth to a new baby seventeen days ago, and family members visited her on Wednesday. A fire broke out in the residence that night.
Upon receiving the news, the family was rescued and taken to the hospital immediately. However, no one could provide clear information on how the fire started. It is speculated that the fire might have originated from gas or mosquito coils.
Sukhi and Jannati have sustained 17% and 15% burns respectively, said the physician.