Two women have been arrested in connection with the theft.
RAB's Additional Director General Col. Ziaul Ahsan told bdnews24.com that the baby was found with one Belly Aktar, alias Rahima, 45, at Gazipur's Boardbazar Upazila around 3am Thursday.
"Rahima says one Rasheda Khanam Parvin, a midwife, stole the baby from the hospital. She got it for her in exchange of Tk 40,000", he said.
Both Rahima and Parvin are now in RAB's custody.
On Aug 20, Runa Akter gave birth to twin babies at the Dhaka Medical College and Hospital. One of the baby boys went missing the next day from the hospital.
According to Akter's mother Gul-e-Nur Begum, a woman was seen loitering around them as soon as the babies were brought back to the hospital ward. When questioned, she said that her sister-in-law, too, had been admitted.
The next day, the woman offered help to calm one of the crying babies and fled with the newborn, said Begum.