What is the correct position of the headrest in a car seat?

The headrest in a car seat should be positioned so that the center of the headrest is aligned with the back of the occupant's head, providing support for the head and neck. It should be adjusted to a height that prevents the head from being pushed forward in the event of a collision. Ideally, the headrest should be as close to the back of the head as possible without pushing it forward, ensuring maximum safety and comfort.