Lingual frenula (see figs 1 & 2), also known as tongue-ties or ankyloglossia, can restrict tongue movement, making it difficult for the infant to latch deeply, and/or maintain a deep latch during feeding. The consequences of shallow latching are nipple pain, nipple trauma, and insufficient milk transfer, resulting in inadequate infant weight gain and a drop in milk supply.

Tongue-ties are often described as anterior and posterior^1,2.