The present invention relates to a car baby seat system, which comprises: (a) a baby seat; (b) a supporting device for the baby seat; (c) positioning mechanism associated with said supporting device and baby seat, for transversally moving the supporting device and baby seat along the rear passengers' seat between at least three states, a safe center-car state, a side-car state, and a loading/unloading state, wherein in the loading/unloading state the baby seat is positioned by said mechanism at least partially outside the car in a rotated orientation relative to the normal use orientation, thereby enabling convenience of loading and unloading of the baby, and additional space for rotation.