Short frenulum, or ankyloglossia, may lead to breastfeeding problems, with an impact on infant development, nipple damage, and early abandonment of breastfeeding. There are currently no homogeneous diagnostic criteria, thus leading to both overdiagnosis and underdiagnosis and associated clinical consequences. The challenge to approach this condition lies in establishing whether it is a normal anatomical variation or a lingual frenulum without a functional impact and when breastfeeding difficulties which are typically attributed to it are actually caused by the frenulum. Approximately 50% of ankyloglossia cases do not result in breastfeeding problems or these can be resolved with support and advice. Surgery may be proposed for the rest of the cases. This article offers an update on the classification and treatment of ankyloglossia, which will help health care providers to provide an adequate management to these patients.