Some baby carriers are built only for wearer of a certain size, others for babies of a certain size, some allow adjustments to be done through buckles, some uses double rings. (babyslingsandcarriers.com)
This is particularly important for wearers of any bust size. (tandemtrouble.com)
Very supportive carrier for those who prefer tying over buckling, and need a carrier that allows wearers of different sizes to bond with baby. (abcdoula.com)