How to use the boy or girl prediction chart? As technology continues to develop, people\’s speculation and expectations about whether it will be a boy or a girl are getting higher and higher. Today, there are many prediction tables that help people predict the gender of their future baby. Let’s take a closer look at how to use the boy or girl prediction chart. 1. Understand the principles of the prediction table and the prediction table of whether it will be a boy or a girl.