Did you know that our ability to move informs our ability to look? Think of driving on a narrow, curvy road for the first time. You pay close attention to how your hands move the steering wheel and your feet move over the foot pedals.
Once you become used to the road, because you’ve driven it many times, you don’t need to focus quite so hard. You can look ahead and visually recognize the familiar curves and your hands and feet operate automatically.
Children show this same characteristic. Until their movement system matures, they can never truly relax and automatically visually attend to a parent/teacher and the lessons you’re trying to teach.
Just like it’s stressful driving on an unfamiliar curvy mountain road for the first time, children can become exhausted or feel on edge when they learn new things.