This term distinguishes parental care involving high amounts of holding and body contact from distal care, where infants are put down, and which is more common in Western cultures. The term derives from anthropological research, where hunter-gatherer bands have been found to carry their babies in slings more than 80% of daylight hours, to respond rapidly to infant frets, and to breast feed frequently on demand.
See Environment of evolutionary adaptedness, Evolutionary psychology, Kangaroo-care