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speech sound norms: 
taken from the goldman-fristoe test of articulation-2 (GFTA-2)

Picture
AGE             INITIAL SOUND                    MEDIAL SOUND            FINAL SOUND
____________________________________________________________________________________
2 years    /b/, /d/, /h/                            /b/, /m/, /n/                       /m/, /p/
                  /n/, /m/, /p/
____________________________________________________________________________________
3 years     /f/, /g/, /k/                             /f/, /g/, /k/                      /b/, /d/, /g/
                   /t/, /w/                                  /ng/, /p/, /t/                     /k/, /n/, /t/
_____________________________________________________________________________________
4 years      /kw/                                      /d/                                 /f/
_____________________________________________________________________________________
5 years     /ch/, /j/, /l/,                          /ch/, /j/, /l/                       /l/, /ng/, /ch/
                   /s/, /sh/, /y/,                         /s/, /sh/, /z/                      /j/, /s/, /sh/
                  /bl/                                                                                   /r/, /v/, /z/
______________________________________________________________________________________
6 years    /r/, /v/, /br/                          /r/, /v/             
                  /dr/, /fl/, /fr/
                  /gl/, /gr/, /kl/ 
                 /kr/, /pl/, /st/ 
                 /tr/
______________________________________________________________________________________
7 years     /z/, /sl/, /sp/                      /th/                                    /th/
                   /sw/, /th/
______________________________________________________________________________________

This table is the age at which 85% of the Goldman-Fristoe Test of Articulation-2 (2000)
Standardization sample correctly produced the consonant and consonant cluster sounds.




Allison Winters
M.Ed., CCC-SLP. C-SLT
Shawnee, KS 66216
913-777-4SLP (4757)

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