In infant mammals, feeding is a critical neuromotor behavior that involves the rhythmic activity of sucking, and swallowing, a reflexive event triggered by milk accumulation in the valleculae. We asked how these behaviors respond to variation in sensory input through the delivery of milk from an automated milk delivery system as compared with bottle feeding. We varied milk delivery rate (2 – 6 Hz) and aliquot volume (0.2 to 0.6 ml) with several combinations at a constant volume flow rate (VFR) of 1.2 ml/s. We measured suck frequency, swallow bolus size, milk transport time, and swallow frequency in six infant pigs, Sus scrofa. We found that all measures were constant across automated milk delivery rates. However, bottle feeding resulted in smaller boluses and lower suck frequencies. While our results on sucking are consistent with previous studies, our constant swallow frequency result differs, likely due to the extreme values used in that study, which did not control for VFR. Smaller boluses in bottle drinking were likely a result of sucking for aliquot acquisition versus the automated feeding where sucking occurs, but doesn’t necessarily correspond to aliquot formation. Smaller aliquots produced exclusively from bottle sucking resulted in reduced bolus transit time and swallow frequencies, suggesting that the efficiency of sucking in infants is a rate limiting step in drinking frequency and the formation of large boluses.