Ankyloglossia, also known as tongue-tie, may lead to speech development problems if left untreated. These problems include difficulty articulating certain letters or sounds - much like a lisp. If by the age of three or four, about half of a child's speech cannot be understood beyond the immediate family, it may be time for an evaluation.
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Honor Society of Nursing (STTI) answered
Children with ankyloglossia, or tongue-tie, have less movement of their tongue because of the tight frenulum which "ties" the tongue to the bottom of the mouth. It can be harder to enunciate or pronounce words properly. If your baby has a tongue-tie, having the tongue-tie fixed is something to consider to avoid future speech problems. However, not all children with a tongue-tie have problems speaking, so please discuss all your questions with your pediatrician.