Ankyloglossia is a common, congenital abnormality often causing feeding difficulties in infants. This study aimed to evaluate indications and outcomes of frenulotomy performed in infants with ankyloglossia for breast-feeding difficulties.85 patients were prospectively identified as they underwent frenulotomy in Pinderfields Hospital ENT outpatient department between February 2008 and February 2011. 52 patients were successfully followed up with a telephone questionnaire about effects on breast-feeding and any complications.All mothers had experienced problems breast-feeding prior to frenulotomy. Following frenulotomy 40/52 (77%) of mothers reported an improvement in breast-feeding within 2 weeks of the procedure. No complications were reported.This study supports the view that ankyloglossia is a common cause of breast-feeding difficulties. However the lack of universal improvement in breast-feeding following frenulotomy suggests that it is not the only cause of problems and supports the clinician approaching these situations holistically and exploring other causes.