Convertible highchair

A convertible seating and stepstool system comprising:

• a support frame;
• at least one seat configured for removable attachment to the support frame;
• and
• a support step assembly affixed to the support frame;
• wherein the convertible seating and stepstool system is convertible between a seating configuration with the at least one seat attached to the support frame, and a stepstool configuration with the at least one seat removed from the support frame, and wherein the support step assembly is affixed to the support frame at a same location in both the seating configuration and the stepstool configuration;
• wherein the support frame comprises first and second front legs and first and second back legs, a front frame crossbar permanently affixed between the first and second front legs, and a lower rear frame crossbar extending between the first and second back legs;
• and
• further comprising a step reinforcement bar extending through the support step assembly and coupled to the front frame crossbar,
• wherein the support step assembly comprises a lower step permanently attached to the front frame crossbar and an upper support platform in engagement with the step reinforcement bar, and at least one intermediate strut extending between the lower step and the upper support platform.