The Iowa-Nebraska Articulation Norms are the recommended ages of acquisition for phonemes and clusters based generally on the age at which 90% of children correctly produce that sound. Vowels should have been acquired by the age of 3.
AGE
3 3 1/2 4 4 1/2 5 5 1/2 6 7 8 9 |
MALES
m, n, h, w, p, b, d t, d, k, initial f g - initial y tw, kw, v, final f initial L, pl, bl, kl, gl, fl voiced th, z, s, spl, sp, sm, st, sn, sk, skw, sw, sl, sh, ch, j, final L, ng voiceless th, initial r, pr, br, tr, dr, kr, fr, gr, final er thr, str, spr, sk |
FEMALES
m, h, w, p, b, d k, g, n, initial f t, y, tw, kw voiced th initial L v, final f, pl, kl, gl, fl sh, ch, j, final L, voiceless th z, s, sp, st, sk, sm, sn, sl, skw, spl, sp, ng initial r, pr, br, kr, fr, tr, dr, gr, final er thr, spr, str, skr |