Abstract: A children's high chair comprises a supporting frame (11,111) for a high chair (12,112) for receiving the child. The frame (11,111) comprises in turn a pair of legs (14,15) openable compasswise and with lower ends (19,119) for resting on the ground and stiffening crosspieces (20,120) arranged on both sides of the frame and movable between a non-operational position allowing closing of the frame and an operational position in which the crosspieces engage the legs to hold them steadily in open position. The crosspieces (20,120) can be moved to another more lowered operational position to rest on the ground to constitute high chair rocking members. Advantageously an automatic battery-powered mechanical rocking device can be provided.

Abstract: The frame is collapsible longitudinally to the extension of the stroller to change from an open position to a folded position and the handlebar has arms (19) engaging in a sliding manner in corresponding seats (20) in the frame to enable traversing downward thereof upon folding of the frame towards the folded position so as to move from a use position to a retracted position. Locking devices (21) operate upon reaching the folded position to hold this position permanently. The locking devices are kinematically connected to the handlebar to be released upon traversing movement of the handlebar towards its use position.

Abstract: A frame assembly (11) and child reception member (12, 112) such as a child reception nacelle or seat with a mutual removable fastening device. The fastening device has controllable hooking members (21, 23) which are arranged on the reception member (12, 112) to engage corresponding fixed hooking members (22) on the frame (11).