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Developmental Norms

Here is a chart that shows when 90% of children can correctly produce the English consonants. Vowels are usually pronounced correctly by the age of three. 
-          Age 3 /m, n, h, d, w, p, b/
-          Age 4 /k, f, t, g/
-          Age 5 /y, v, ing/
-          Age 6 /l, j, r, ch, zh, sh, wh/
-          Age 7 /s, z/
-          Age 8 /th, blends/
 
Common Phonological Processes
These should not persist beyond age 5
-          Final consonant deletion- child says “ba” instead of “ball”
-          Syllable reduction- child says “nana” instead of “banana”
-          Vowelization- child says “penso” instead of “pencil”
-          Gliding- child says “wed” instead of “red”
-          Cluster reduction- child says “boom” instead of “broom”
-          Doubling- child says “wa-wa” instead of “water”
-          Initial consonant deletion- child says “all” instead of “ball”
-          Backing- child says “gog” instead of “dog”
-          Fronting- child says “tat” instead of “cat