Baby safety car seat convertible into a rollable baby seat

A baby safety car seat having, at least when in use, a state in which it is convertible into a rollable baby seat, and comprising at least in the state:

• a lower, support portion including a seat lowermost area configured to contact an external surface to which the seat is to be mounted, and defining a horizontal base plane, and two leg attachment areas on two sides of the lowermost area having a common horizontal axis disposed above the horizontal base plane;
• an upper, seating portion having a front, head area and a rear, feet area, the head area being spaced from the horizontal base plane to a distance greater than the feet area;
• and
• a right and left pair of front and rear legs, the legs of each pair having distal ends associated with wheels and proximal ends articulated to the lower support portion of the seat at the same corresponding leg attachment area at locations spaced from each other, the front and rear legs of each pair being rotatable about the common horizontal axis, relative to each other and to the lower support portion of the seat between a storage position to be taken in a safety car seat mode of the seat, in which the distal ends of the legs are disposed above the horizontal base plane, and an operational position to be taken in a rolling-carrier mode of the seat, in which the distal ends of the legs are disposed below the horizontal base plane, and both legs of each pair, when in the storage position, having their distal ends disposed under the head area of the upper seating portion.