Crossing your legs in the “W” position is a seemingly innocent way of sitting chosen by a large amount of children. Most parents don’t attach a lot of importance to it, which is a shame. Crossing legs this way is connected to a larger amount of negative consequences instead of, for example, sitting with your legs crossed or with rolled legs.
Sitting this way shortens and tightens the muscles of the legs, which often leads to forefoot. Although children feel very comfortable in this position, in the long run it’s not safe for them. The side effects of the “W” position include: developmental problems, orthopedic defects, and difficulties in controlling posture in the still developing child.