By combining a wedged cushion and specialized method for aligning a user's ischial tuberosities--which increases relative lordosis in the lumbar spine and pelvis venous outflow from the lower extremities, in a sitting position by decreasing venous obstruction and enhancing flow at the femoral vein level, novel seating products are achieved which are particularly amenable to installation in combination with conventional children's seating mechanisms, using seat cushions, inserts, or specialized plastic-related enhancements. Proper spinal alignment, growth and sustainable posture are further possible for developing systems according to the teachings of the present disclosure.