Speech
Sounds
|
50% of
children by the age of:
|
90% of
children by the age of:
|
n, m, p, h
|
< 24
months
|
36
months
|
t, k
|
24
months
|
44-48
months
|
f
|
30
months
|
48
months
|
w
|
< 24
months
|
36 months
|
ng
|
24 months
|
>48
months
|
b
|
< 24
months
|
48
months
|
y
|
30
months
|
48
months
|
d
|
24 months
|
48
months
|
l, r
|
36months
|
>48 months
|
sh, ch
|
42months
|
>48 months
|
J as in “jump”, v
|
48months
|
>48 months
|
Z
|
42months
|
>48
months
|
Voiced and voiceless th
|
48months
|
>48 months
|
Chart adapted from Prather, D. L. Hedrick, and C. A. Kern “Articulation
Development in Children Aged Two to Four Years,” Journal of Speech and Hearing
Disabilities, 40 (1975): 179-191 (p. 186).
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=5&cad=rja&ved=0CFAQFjAE&url=http%3A%2F%2Fwww.asha.org%2FuploadedFiles%2Fasha%2Fpublications%2Fcicsd%2F1991ArticulationDevelopmentinChildren.pdf&ei=ErR2UqXNN5TCyAHdsoCwCg&usg=AFQjCNFVwgH0Xv1OFYxD2ucpQ-Kswq9j1Q&sig2=jLsz9X9kN_AbhR30TOwtgw&bvm=bv.55819444,d.aWc
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=5&cad=rja&ved=0CFAQFjAE&url=http%3A%2F%2Fwww.asha.org%2FuploadedFiles%2Fasha%2Fpublications%2Fcicsd%2F1991ArticulationDevelopmentinChildren.pdf&ei=ErR2UqXNN5TCyAHdsoCwCg&usg=AFQjCNFVwgH0Xv1OFYxD2ucpQ-Kswq9j1Q&sig2=jLsz9X9kN_AbhR30TOwtgw&bvm=bv.55819444,d.aWc
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