*Wolff P: H: The serial organisation of sucking in the young infant Paediatrics 1968. 42:943-956. Kent, J. C., Ramsey D. T., Doherty, D., Larsson, M., and Hartmann, :E: Response of breasts to different stimulation patterns of an electric breastpumpJournal of Human Lactation (2003) 19: 179-186. Mizuno K, Ueda A. Changes in sucking performance from nonnutritive sucking to nutritive sucking during breast — and bottlefeedingPediatr Res 2006; 59(5): 728-731