by combining a wedged cushion and specialized method for aligning a user &# 39 ; 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 &# 39 ; 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 .