A bullet hit Sejal Jadon (7) in stomach when some people fired in the air during a wedding in Old Gwalior area in the early hours yesterday, said police inspector M M Malviya.
The girl was sitting in a chair at the wedding venue when the bullet hit her.
Inspector Malviya said that police have registered a case of culpable homicide not amounting to murder under section 304 of the IPC against an unidentified person.
Police were trying to identify the culprit, he added.