Q: I have a four-year-old male client whose only consonant is D. He says “telephone” as “Deh-duh-doh.” How do I teach him other phonemes? Therapists use a wide variety of methods to stimulate new phonemes.  I have summarized them in an article published by the Oral Motor Institute (Marshalla, 2008).  I also have put this information into my newest seminar, titled “21st Century Articulation Therapy.”  It also will appear in my next book to be called “The Marshalla Guide to…