The Truth: W sitting can be a more stable sitting position for children. However, this is because in the W pose, children do not have to work quite as hard to engage their core and hold their trunks upright. Instead, they spread their lower limbs to create a wider base of support, relying on their joint structures (and not their muscles) to hold them up. In this position, the muscles are not stabilizing the hip joints. This causes increased posterior pelvic tilt (the front of the pelvis rises and the back of the pelvis drops), which can result in poor sitting posture, decreased core activation, reduced trunk rotation, and delayed fine motor development.