FYI: no frenulum is technically called ankyloglossia. Ankylo, from Greek, means crooked, bent, or a fusion or growing together of parts. Glossia refers to the tongue. So ankyloglossia is a fusion of the tongue to the floor of the mouth. Tongue-tie, or a short and/or tight lingual frenulum that impairs optimal function of the tongue, is more correctly termed "partial ankyloglossia". True ankyloglossia must be corrected by surgically creating a separation between the tongue and the "floor of the mouth". A baby with this condition is probably affected in other ways because ankyloglossia usually appears as part of various syndromes. It is rare but would definitely preclude breastfeeding until corrected. Then the therapist must consider whatever else is wrong with the baby. Alison K. Hazelbaker