The ERGO Baby Carrier s ergonomic design supports a correct sitting position for the baby s hip pelvis and spine growth It disperses most of the baby s weight between the hips and thighs which helps to eliminate compression of the spine when hanging by the crotch which most other designs require The ERGO also balances the baby s weight to parents hips and shoulders and alleviates physical stress for the parent Comes with LED Safety Reflector Light