Abstract: A child carrier having a waist belt attached to a bottom support of the child carrier, where the waist belt is adjustable from a first position along the bottom support to a second position along the bottom support, thereby to change the size of the seat formed in the child carrier, and to facilitate carrying of different sizes of children in an ergonomically safe way. The child carrier may also be used in an ergonomically safe way, for children of specific sizes, when the waits belt is fully detached from the bottom support.