While four of the accused were arrested earlier, remaining two were arrested today, police said.
Nanji Javiya (67) and Arvind Kubawat (60) were arrested in the case on March 13 on the basis of the complaint lodged by the survivor's mother at Bhaktinagar police station.
Their questioning revealed that a total of six persons had raped the girl on separate occasions, police said.
The girl, who was eight months pregnant, gave birth to a baby girl.
"The victim's condition is stable. The newborn baby had some health problems and has been admitted to a government-run children's hospital," a police official said.
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.