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Children with a lisp have trouble articulating the “z” and “s” sounds. While young children often have trouble pronouncing sounds, children over the age of eight can typically articulate the “s” sound. Children typically begin to learn the “z” sound at about four years of age, and they typically have a firm grasp on the sound by the time they are eight. If your child is over the age of eight and still displays a lisp, have him evaluated by a speech-language pathologist (SLP). It’s also a good idea to bring him to an SLP earlier if you think he may be displaying a language delay. The earlier a child with a lisp receives speech therapy, the more readily his articulation may be corrected.