While Shirley Temple had a lot of natural abilities and other assets, she also had teams of people helping her. She had vocal coaches, choreographers, screen writers, composers, directors, photographers, costumers, hair dressers, and make-up artists helping to make her look good. She even had dentists who made little dentures so the public never saw her with missing teeth.
The Shirley Temple "child star of the 1930s" exuded pure "Cute Factor." Some of that was natural, but a lot of it came about because of her handlers. Her vocal range was actually quite limited, so her composers wrote songs that would fit her range and abilities. "Animal Crackers in My Soup," "On the Good Ship Lollipop" and "I Love to Walk in the Rain" are three she was quite famous for introducing.