A child car seat, comprising: - a backrest extending between a lower portion and an opposite upper portion along a longitudinal direction (X-X); - a sitting portion connected to the backrest at the lower portion of the backrest; - a headrest connected to the backrest at the upper portion of the backrest; - adjusting means configured to adjust the position of the headrest between a lower position and an opposite upper position along the longitudinal direction (X-X), the distance of the headrest from the lower portion of the backrest along the longitudinal direction (X-X) increasing from the lower position to the upper position; the adjusting means comprising: - a first guide fixed to the backrest and arranged along the longitudinal direction (X-X), and - a slider movable along the first guide and switchable between a first configuration, in which the slider is movable along the first guide to move the headrest between the lower position and an intermediate position, comprised between the lower position and the upper position, and a second configuration, in which the slider is movable along the first guide to move the headrest between the intermediate position and the upper position, characterized in that: - the first guide comprises a first and a second guide element and the slider comprises a first and a second sliding element; and - in the first slider configuration the first sliding element is engaged with the first guide element to slide along said first guide element, while in the second slider configuration the second sliding element is engaged with the second guide element to slide along said second guide element. - a backrest extending between a lower portion and an opposite upper portion along a longitudinal direction (X-X); - a sitting portion connected to the backrest at the lower portion of the backrest; - a headrest connected to the backrest at the upper portion of the backrest; - adjusting means configured to adjust the position of the headrest between a lower position and an opposite upper position along the longitudinal direction (X-X), the distance of the headrest from the lower portion of the backrest along the longitudinal direction (X-X) increasing from the lower position to the upper position; the adjusting means comprising: - a first guide fixed to the backrest and arranged along the longitudinal direction (X-X), and - a slider movable along the first guide and switchable between a first configuration, in which the slider is movable along the first guide to move the headrest between the lower position and an intermediate position, comprised between the lower position and the upper position, and a second configuration, in which the slider is movable along the first guide to move the headrest between the intermediate position and the upper position, - the first guide comprises a first and a second guide element and the slider comprises a first and a second sliding element; and - in the first slider configuration the first sliding element is engaged with the first guide element to slide along said first guide element, while in the second slider configuration the second sliding element is engaged with the second guide element to slide along said second guide element.