Some babies with tongue-tie have a mild case and are rarely affected. If the condition is severe, the tongue is almost completely attached to the floor of the mouth.
Doctors do not always agree on how to identify tongue-tie, especially if it is mild. Because of this, it is difficult to say how common it is. Some studies have shown that about four per cent of babies have tongue-tie. Others found it to be much more common, affecting about 11 per cent.