The child was taken to a nearby hospital where a medical examination confirmed rape. She was then shifted to All India Institute of Medical Sciences (AIIMS) where her condition is said to be stable.
The police have arrested the neighbour.
Over the last few weeks, a grisly series of attacks on young girls have stunned the country. In Delhi, a five-year-old was kidnapped and sexually assaulted by a neighbour in a room right below where her family lived. A 13-year-old who was gang-raped by eight men over nine days is recovering at Delhi's AIIMS hospital.
The deplorable safety for women and the police's incompetence and inefficiencies were exposed with brutal force in December when a physiotherapy trainee, 23, was gang-raped on a moving bus in Delhi. Her male friend and she were assaulted with iron rods. She died two weeks later, triggering angry street protests, which forced the government to introduce tougher laws to punish sexual crimes against women.