Safe oral feeding of infants necessitates the coordination of suck-swallow-breathe. Healthy full-term infants demonstrate such skills at birth. But, preterm infants are known to have difficulty in the transition from tube to oral feeding. Aim: To examine the relationship between suck and swallow and between swallow and breathe. Sucking suction and expression , swallowing, and respiration were recorded simultaneously when the preterm infants began oral feeding i. The full-term infants were similarly monitored during their first and 2nd to 4th weeks. Results: The rate of milk transfer in the preterm infants increased over time and was correlated with average bolus size and swallowing frequency.