The mother of the two-year-old battered baby has been traced and will undergo a DNA test to ascertain whether she is the biological mother of the child.

A senior police official said they traced the mother named Munni last night and she is being brought to Delhi.

Munni, the 22-year-old woman, has allegedly left her daughter, Falak with one Laxmi in September last year in Delhi and had disappeared. The baby later landed with Rajkumar, the main suspect in the case who is still at large.

Rajkumar is alleged to have left his wife and son to elope with a 14-year-old girl who brought Falak to AIIMS on January 18.

Falak has been battling for life at the AIIMS hospital, were she was brought on January 18 with severe head injury, both her arms broken, bite marks all over her body and her cheeks branded with hot iron.

The teenage girl, who brought her there claiming to be her mother, had cited a fall from the bed as the reason for the child's pathetic state. Munni has claimed that her husband was forcing her into prostitution and she had run away from her home, police say.

A police officer said Munni was found about a week ago in Rajasthan and brought here Sunday night. The police officer expected Munni to give the investigators some leads into the case which is suspected to be connected to prostitution.

Five people -- Munni, Sandeep, his wife Pooja, Aarti and Jitendra Kumar Gupta, the teenager's father who used to physically assault her -- have been arrested so far.

The teenager, who initially claimed to be Falak's mother, is now in a juvenile home. She got the baby from Rajkumar, the key accused in the case who is on the run. Falak has already undergone two life saving surgeries till now.