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    Sound Acquisition Chart- (Iowa-Nebraska Articulation Norms) This chart shows at what age males and females should acquire consonant sounds. 

     Age

     Males

     Females

       
     3 years m, n, h, w, p, b, d m, h ,w, p, b, d
       
     3.5 years t, d, k, f- k, g, n, f-
       
     4 years g t, y, tw, kw
       
     4.5 years 

     voiced th

       
     5 years y- l-
       
     5.5 years tw, kw, -f, v v, -f, pl, bl, kl, gl, fl
       
     6 years l-, pl, bl, kl, gl, fl sh, ch, j, -l, voiceless th
       
     7 years voiced th, z, s, spl, sp, sm, st, sn, sk, skw, sw, sl, sh, ch,j, -l, -ng z, s, sp, st, sk, sm, sn, sw, sl, skw, spl, sp, -ng
       
     8 years voiceless th, r-, pr, br, tr, dr, kr, fr, gr, -er r-, pr, br, kr, fr, tr, dr, gr, -er
       
     9 years thr, str, spr, sk thr, spr, str, skr
Last Modified on February 22, 2016