Here's why:
* Her Age: Temple started acting as a toddler and was famous for her youthful charm and dancing abilities. It would have been difficult to find a child who could convincingly replicate her signature moves.
* Skill: Shirley was incredibly talented and practiced her routines rigorously. She was known for her professionalism and willingness to perform even challenging stunts, such as those involving dancing and water.
* Safety: While child labor laws were less strict in the 1930s, studio executives were still concerned about the safety of their young stars. It's highly likely that they would have taken every precaution to ensure Temple's safety.
Of course, it's impossible to say for sure what happened behind the scenes. However, considering the available information, it's highly unlikely that Shirley Temple used a stunt double.