The principle Children’s bodies are dynamic systems means that: September 21, 2022 by 8i9x6 Development in one component of the body may affect development in another component. Children’s growth reflects a continuing pattern of speeding up, slowing down, speeding up, slowing down again, and so on. Development proceeds in a top-down fashion, from the head to the feet. Development proceeds in an in-out fashion, beginning with the head and torso and proceeding to the arms and legs and then to the fingers and toes. See Answer Development in one component of the body may affect development in another component.