A ring sling is a carrying aid in which two firmly sewn rings are attached to a piece of sling.
The ring sling is very suitable for newborns and premature babies, because you do not have so much fabric to stow. This makes it generally very comfortable to wear in the ring sling even in summer.
Small, light babies can also be carried in front of the belly.
Older and heavier babies and toddlers you then carry on the hip.
Since you only have a one-sided load on one shoulder with the ring sling, we do not recommend the ring sling as the sole carrying aid for the entire carrying time. It is (for heavier babies) rather intended for short distances.