Shoulder straps: Baby carriers with wide shoulder straps can be bound off, eg. with a hair tie. So, a neck rest is created, the back part is shortend and the field of view is widened for your baby.
Strap/bridge: If the strap of your baby carrier is too large, it can be bound off with a silk stocking or a cheesecloth. So, the cloth extends from hollow of the knee to hollow of the knee, which guarantees the ergonomical spread-squad-position.