I think a reference picture may help.
Pictures of cradleboards across the native American nations: http://gelean.tripod.com/papoose.html
These are generally worn with either backpack style or 'criss cross' style straps, although some nations/tribes have been known to use a single forehead strap, requiring the head to be held on a downward angle, sometimes supplemented with a 'grab strap' or shoulder strap setup as well.
They are designed to go right from floor to back-carry in an instant, enabling the mother to carry her kid at even the great paces set during frantic escapes or long journeys from hunting ground to hunting ground.
*interesting side note: I appear as white as they come (although Im a smidgeon..like 1/5th Apache), and yet my ma' used something similar to the Cheyenne nation cradleboard on me, because they were members of YMCA 'Adventure Guides' (known as Indian Guides back then...1970s) and had to dress 'en costume' for induction ceremonies (which my father helped run at the Ohio camp: Tippecanoe each summer).