I have a freedom pouch sling and even though its adjustable it just hangs too low and my back is now in bits and I can only wear it for about 5 mins. Can someone please suggest a comfortable sling that won't strain my back and shoulders. I am off to London in a few weeks and need it before then. I have 2 conventional baby carriers but apparantley they are not so good for the babies back, I am 5 ft 1 so I am especially interested to hear what the shorter baby wearers are using