A table seat (1) comprising a foldable frame (1A) supporting an at least partially foldable container or sitting portion (2) for receiving and supporting a child, said frame (1A) comprising opposing lateral portions (3) enabling the seat (1) to be removably fixed to a top (5) of the table (6), each portion (3) comprising an upper arm (10) and a lower arm (11) which are superposed, the second arm (11) comprising at least one movable intermediate portion (17) arranged to lowerly contact said table top (5) and at least one end portion (16), the child container (2) being associated with a support portion (50) fixed to said lateral portions (3). The child container or sitting portion (2) comprises a structure (55) rotatably associated with said support portion (50) and enabling the child to be arranged in different spatial positions relative to the table (6), said structure (55) being rotatable about a central axis (W) perpendicular to a geometrical plane parallel to said table top (5).