Articulation Development Chart

In the chart below, each solid bar indicates when children generally MASTER the specified sounds. This chart depicts a range of development and should only be used as a general guide.

Target Sound	*Age at which 90% of males have acquired phoneme and cluster	Initial Position	Medial Position	Final Position
p	3.0
m	3.0
n	3.0
w	3.0
h	3.0
b	3.0
g	4.0
k	3.6
f	3.6
d	3.6
ng	7.0
j (y)	5.0
t	3.6
sh	7.0
ch	7.0
l	6.0
r	8.0
dz (j)	7.0
th (unv)	8.0
v	5.6
s	7.0
z	7.0
th (v)	7.0
bl	6.0
br	8.0
dr	8.0
fl	6.0
fr	8.0
gl	6.0
gr	8.0
kl	6.0
kr	8.0
kw	5.6
pl	6.0
sl	7.0
sp	7.0
st	7.0
sw	7.0
tr	8.0

Source: Smit, Et. Al. “The Iowa Articulation Norms Project and its Nebraska Replication” Journal of Speech and Hearing Disorders Volume 55, 779-798, November, 1990.