The key elements include interesting illustrations or pictures to go along with the text. A story that evokes emotions like happiness, curiosity, or excitement works well. And it's important that it's not too long or complicated for young minds to follow.
A good children's short story typically has colorful and vivid characters. The story should have a clear beginning, middle, and end, and teach a valuable lesson or moral in an unobtrusive way. Plus, it helps if it has some element of surprise or magic to capture their imagination.