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Tracings of nonnutritive and nutritive sucking monitored 3 min apart during same-feeding sessions of an infant born at 33 and 1/7 wk gestational age introduced to oral feeding at 34 and 2/7 wk postmentrual age (A) and attaining independent oral feeding at 36 and 1/7 wk postmentrual age (B). The frequency difference in the nonnutritive (2 cycles/s) and nutritive (1 cycle/s) sucking patterns likely results from the absence and presence of subsequent swallowing events, respectively.
