Speech Sound Development Chart

Horizontal bars indicate a range of typical sound development in children.

YEARS OF AGE
Speech Sound Development Chart
Source: Sander, Eric K. "When Are Speech Sounds Learned?" JSHD, 37 (February 1972).


Initial, Medial and Final /p/ Sounds

The /p/ sound, a voiceless phoneme, is an early developing sound, and is one of the first sounds in a child's repertoire, and is usually articulated between 3-4 years of age.


Initial, Medial and Final /b/ Sounds

The /b/ sound, a voiced phoneme, is an early developing sound, and is one of the first sounds in a child's repertoire, and is usually articulated between 3-4 years of age.


Initial, Medial and Final /k/ Sounds

The /k/ sound, a voiceless phoneme, is an early developing sound, and is usually articulated between 4-5 years of age.


Initial, Medial and Final /g/ Sounds

The /g/ sound, a voiced phoneme, is an early developing sound, and is usually articulated between 4-5 years of age.


Initial, Medial and Final /d/ Sounds

The /d/ sound, a voiced phoneme, is an early developing sound, and is usually articulated between 4-5 years of age.


Initial, Medial and Final /t/ Sounds

The /t/ sound, a voiceless phoneme, is an early developing sound, and is usually articulated between 4-5 years of age.


Initial, Medial, Final and Blend /l/ Sounds

The /l/ sound is a later developing sound, usually articulated between 6-7 years of age.


Initial, Medial, Final and Blend /r/ Sounds

The /r/ sound is a later developing sound, usually articulated between 7-8 years of age.


Initial, Medial, Final and Blend /s/ Sounds

The /s/ sound, a voiceless phoneme, is a later developing sound, usually articulated between 7 years of age.


Initial, Medial and Final /ch/ Sounds

The /ch/ sound, a voiced phoneme, is a later developing sound, usually articulated between 7-8 years of age.


Initial, Medial and Final /sh/ Sounds

The /sh/ sound, a voiced phoneme, is a later developing sound, usually articulated between 7-8 years of age.


Initial, Medial and Final /ch/ Sounds

The /th/ sound, a voiced and voiceless phoneme, is a later developing sound, usually articulated between 8-9 years of age.