Assortment of boys and girls sitting as seen from the back profile. Children are always moving between various sitting positions at home or at school as they play and learn. Naturally taking on postures that are comfortable to their bodies, children most commonly sit in positions that include: Criss-cross applesauce (legs crossed), legs in front, legs to the side, on their knees, or W position. W Sitting, when a child sits on their butt with their knees bent and feet angled outward, is known to put your child at risk for injuries and limited core strength and flexibility and should be corrected whenever possible.