How to Scientifically Measure Children\’s Height and Weight Height and weight are a very important indicator in the growth of children. To maintain a healthy figure, you need to constantly pay attention to your height and weight. And for a four-year-old baby, how to scientifically measure the height and weight? 1. How to measure height When measuring your baby\’s height, you need to pay attention to: stand on a hard surface (such as the floor); align the back of your head with the wall; relax your arms and palms and keep them close to the body. Then, use a ruler