According to experts, overweight schoolbags will have long-term adverse effects on children. When the weight of schoolbag exceeds 15% of its weight, the working intensity of muscles in these parts of the body will be greatly increased, and fatigue will occur in a short time. If a growing child is allowed to carry a heavy schoolbag for a long time, it will cause muscle fatigue, the trunk will lean forward, and eventually the spine will be deformed, which is what we often call hunchback. When the primary school grows up, it is easy to cause scoliosis deformation, O-shaped legs or X-shaped legs, and the arch of the foot may be pressed into flat feet, which may also lead to premature ossification of the child and fail to reach the height it should have reached. The weight of the schoolbag will not affect the height. On the contrary, proper load can also enhance the strength of back muscles, but if the load is too heavy, it will affect the development, and may even cause waist deformation. The best and most effective way to increase is of course exercise. In the growth and development stage, you should keep a good balance of nutrition, that is, before the bones of 14~20 years old are completely healed, your height will definitely increase a lot in half a year.