Tongue clipping in children, professionally known as tongue lengthening, is a procedure performed on children with short tongue ligaments. The short tongue ligament in children is a congenital disorder that mainly affects the child’s pronunciation. The timing of the surgery is controversial, but some experts and scholars believe that tongue lengthening surgery should be performed between the ages of 1 and 2. This is mainly related to the time when children start to learn to speak. As children generally start to speak after the age of 1, experts believe that tongue lengthening surgery at this time will help children to have a better tongue ligament when they start to speak. However, some experts now believe that tongue lengthening should be performed around the age of 4 or later. This is because the language center is not fully developed until the age of 4 and because clinical observation shows that the tongue ligament itself has a gradual tendency to move backwards, so it is recommended that children undergo surgery after the age of 4 when the tongue ligament is stable.