From the medical journal Pediatrics:, one of the Neonatal Intensive Care Unit Network Neurobehavioral Scale Procedures.

H. Pick up Infant (States 4 and 5)
Cuddliness
This item is a summary measure of the infant’s response to being held in alert states. There are several components that are scored in response to the infant being held in a cuddled position both horizontally against your chest and vertically on your shoulder. The infant’s resistance to cuddling should be assessed as well as the ability to relax or mold, nestle, and cling to you. Give the infant a chance to initiate cuddling (~10 seconds). Facilitate cuddling only if there is no active participation on the part of the infant or if the infant is unable to relax or mold. If the infant initiates cuddling, score 5 and above. Cuddliness should not be administered with the infant swaddled. Also, refrain from talking to the infant during the administration of this maneuver. Assign separate scores for Cuddle in Arm (horizontal) and Cuddle on Shoulder (vertical).