shown in fig2 the arms 3 are arranged to extend obliquely downwards from their pivot axis so that the cross piece occupies a lower position forwardly of a vertical centre plane through the side frames and preferably extending axially of and between the forward wheels 2a a tray 7 is rigidly mounted between the frames when the apparatus is in this configuration and has a handle bar 8 on which a young child may support itself when using the apparatus as a baby walker the tray has a recess which may be used to receive a plate 9 on which an activity centre or playthings are mounted the cross piece 4 is of telescopic construction so that it may be shortened to reduce the inter frame spacing when the apparatus is to be used as a baby walker or lengthened when it is to be used as a baby gym the construction of the apparatus will now be described in more detail referring to fig3 it will be seen that each of the wheels 2a and 2b is journalled on a spigot 21 protruding from a boss 22 within a recess 23 in the outer side of the respective lower lobe of the frame each upper lobe 13 is formed with an internal vertically extending slot 75 opening to its upper side a screw 71 having an enlarged head passes through a bore 72 opening into the slot 75 in the baby walker configuration the screws 71 are screwed into threaded inserts.