Not all tongue-tied infants fail to thrive. A sub-set of infants with ankyloglossia gain rapidly and are fussy during or after feeding. Some display colicky behavior and begin refusing to feed by 12-16 weeks of age. Cervical auscultation revealed disorganized sucking in a series of these infants which improved or resolved within days of frenotomy. This presentation explores the research basis for using cervical auscultation to study suck:swallow rhythms and presents the results of this case series.