Knitted baby sling?

:shrug: is it possible or would the yarn strech too much? anyone know of a pattern? i am thinking cotton would be best (washable, not too warm)… :?? thanks again
like these

only how do i know how many to cast on… lol is it just a simple tubey or are there increses where the bum would be… :?? http://www.balterbaby.com/images/tickle-turdle/Peppercorneombresling.jpg

Well, I think cotton would be the least stretchy so it’s probably best. I’m not sure about the pattern though. :thinking: