Tongue tie (ankyloglossia) affects 1 in 10 babies. This is when the strip of skin connecting your baby's tongue to the bottom of their mouth is shorter or thicker than normal. A tongue tie can involve the entire underside of the tongue or just part of it.
A tongue tie is there when your baby is born. Some babies who have a tongue tie are not bothered by it. Others can't stick out their tongue. About half of babies with a tongue tie will have difficulty feeding.