Battered baby back on life support New Delhi, Jan 30 (IBNS): The battered two-year-old baby fighting for her life at the AIIMS trauma care centre in New Delhi has to be put back on the life support system after past two days of some improvement, media reports said on Monday. Reports said her condition deteriorated Sunday night and she had to be again put on ventilator following breathing problems. Doctors at All India Institute of Medical Sciences (AIIMS) earlier in the morning on Sunday had said the baby was critical but stable. Meanwhile, the youth being seen as a prime suspect for the baby's battered condition is yet to be traced though his whereabouts are now with the police. The battered baby was brought to the hospital by a 15-year-old girl on Jan 18 who claimed herself to be the girl's mother and later said she was sexually abused too by her boyfriend, now seen as the prime suspect. The boyfriend, identified as Rajkumar, has left for Mumbai and his phone is switched off, media reports said. Rajkumar, police said, had handed over the baby to the teenaged girl. The teenager in one version said the baby had fallen from the bed and in another said she beat her up in a fit of rage, while doctors said the baby underwent much more and there are bite marks all over her body apart from the severe brain damage. Police were tracing the baby's biological parents while the 15-year-old girl is now in a juvenile home. The baby's brain has got evidence of serious injury and the part of the brain that uses judgement is damaged, the doctor said earlier. "She will not be able to recover soon. We have not seen such type of battered babies before," Sumit Sinha, an associate professor of neurosurgery who is among the team of doctors treating Falak, the battered baby, had said. Sinha said the girl went through severe emotional and physical trauma and such cases are rare by Indian standards. The National Commission for Protection of Child Rights (NCPCR) had ordered a detailed investigation in the case and asked for a factual report from the Delhi police in 15 days' time. The teenager who had brought the baby herself had fled home in May 2011 to escape an abusive father and ended up with a boyfriend, who abused her sexually. The 22-year-old man, Rajkumar, is reportedly married and has family in Mumbai. A media report said the Women's Commission has opposed to giving the custody of the girl to her father who now claims it. Delhi Chief Minister Sheila Dikshit said her government will lend all support to the baby.