 The exclusion criteria were major congenital abnormalities, craniofacial malformation, intracranial hemorrhage, bronchopulmonary dysplasia, culture-positive sepsis, and necrotizing enterocolitis. Each swallowing-sound recording was 2 minutes long and was captured in a quiet environment by the same investigator. The feeding parameters generated from the recordings were as follows: total number of swallows S, total number of rhythmic swallows RS, total number of resting intervals RI, average time between resting intervals ATRI, average time between swallows ATS, average time between rhythmic swallows ATRS, maximum number of rythymic swallows MRS, and volume of milk ingested VM during the 2-minute evaluation. 