By participating with their parent they develop their senses faster, cry less, learn more, and thrive better because they are less bored and more relaxed and secure. A baby in a sling can nurse conveniently, easily and discreetly. A baby raised in a Over The Shoulder Baby Holder needs to be carried less as they get older than their counterpart who was raised in mechanical devices. Sling babies are less clingy. This is because they are more secure, self reliant and confident.
Older siblings are more accepting and less jealous of a new arrival when it is carried in a sling.