Child's padded shoulder sling (Sandhills)

My 8 year old son has been a victim of hit and run luckily he's walked away with fractors and bruises broken finger and slight confusion his bike saved his life (its now snapped in half) Desperately needed a child sling with a padded shoulder he has a sling for his arm but the pressure on his collar bone to keep it elevated is bringing him to tears because of the swelling and bruising across his chest any help would be much appreciated