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The threshold of 7 mm Hg was chosen based on early sucking research that used a baseline of 7 mm Hg to examine the effects of oral solutions on sucking patterns [ 13 ]. Predictors of nutritive sucking in preterm infants. The digital and video recordings were compared for start and finish times of the oral feeding and periods of sucking and resting. Additionally, this study only included healthy preterm infants. An interaction between time and PMA group was tested, but it was not significant. A mixed-effects regression model was employed to examine the effect of time in days on the difference in sucks between the 7 and 20 mm Hg pressure thresholds. Table 2 demonstrates the mean difference in the number of sucks detected at the 7 mm Hg compared to the 20 mm Hg threshold by PMA group and observation. As an infant matures, expected changes in sucking patterns include increases in sucking frequency, maximal sucking pressures, number of sucks per sucking burst, and decreases in time between sucking bursts [ 9 ].

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