The main symptoms of children’s flat feet are as follows: 1. There are obvious changes in the shape of the foot, for example, in the dorsal part of the foot, the arch of the foot becomes very flat, resulting in a very flat and wide look of the child’s foot. 2. 3. the child may feel pain in the foot, and the child often reports pain in the foot, especially in the heart of the foot, and is reluctant to walk long distances or do outdoor sports activities. 4. the child’s motor ability may be significantly reduced compared to other normal children, for example, the child may run very slowly, and may not jump high, and is often easily fatigued after doing sports activities.