Her best remembered role as a child artiste was in R. K. Films’ Boot Polish (1954) and Bimal Roy's Devdas.
[3][4] In 1958, a Hindi film adaptation called Do Phool (Two Flowers) was released based on the Swiss literary novel/ icon Heidi.
The role of Heidi – called Poornima in the film – was played by Baby Naaz who was one of the most famous child stars at the time along with Master Romi.
[5] She matured into a character actress and bagged good roles in films like Bahu Begum, Kati Patang and Sachaa Jhutha (where she played Rajesh Khanna's physically challenged sister).
Before Sridevi started using her own voice, Kumari Naaz dubbed for her in the early Hindi hits of the 1980s.