For the second day, dozens of people laid siege to the police headquarters at ITO square, demanding the sacking of Delhi Police commissioner Neeraj Kumar.
They also sought the sacking of two erring policemen who delayed investigations into the case, after the victim's parents complained of her disappearance.
Police have since suspended two officials.
Many of the young protesters who raised slogans and waved banners were members of the Arvind Kejriwal-led political party Aam Aadmi Party (AAP).
As the police erected barricades to keep the crowd out of the police headquarters, many people sat on the road, clapping and singing songs in protest.
At the All India Institute of Medical Sciences ( AIIMS) too, where the five-year-old victim is under treatment, the crowds camped in protest since morning, raising slogans and demanding death for the rapist.
Police have barricaded the main entrance to the premier hospital, to enable easy entry and exit for patients and ambulances.
Doctors said the five-year-old is recuperating, though in need of massive reconstructive surgery, as her private parts were severely damaged.
The girl was abducted, assaulted and tortured by her 22-year-old neighbour, who is now in custody.
Rape victim stable: Doctors
The five-year-old girl is in "stable" condition after undergoing surgery, doctors said on Sunday.
"She is stable and is responding well to treatment," DK Sharma, medical superintendent of the All India Institute of Medical Sciences (AIIMS), told reporters.
"Her vital parameters are ok and she faces no threat to her life. She is alert and spoke to her parents and doctors," said Sharma, adding that she had "mild fever".
"The child is showing gradual recovery. She slept well during the night. She is responding well to anti-biotics."
He said the girl, raped by her 22-year-old neighbour, had undergone "colostomy" surgery. This is a procedure to create an alternative route for stool to pass.
Asked if the girl understood what she had undergone, the doctor said: "She was perhaps too young to understand what happened.
"I will not say she is scared, perhaps she is too young to understand the gravity of her condition," he said.
(IANS)
