I have just won a bubzilla sling and i have to collect it from the adelaide parenting expo, my question is - I am 5'4" and a size 10-12, what size sling should I get? i hope to be able to share it with DH who is 6'0" but if we cant use the same size comfortably then it will be me using it. some help would be appreciated by Saturday morning as we are going in the afternoon.