the usual carrying method for a small child is the "hip-carry". carrying
a child on the hip without a sling strains the arm and makes it tired. with
the sling you can carry even a fairly heavy child for a long time without your
arm becoming painful because the baby sling distributes the weight of the child
equally between hip and shoulder.
apart from this the baby’s back is supported better than without the sling,
an important factor when the baby is still unable to sit upright by itself.
