Speech - Mrs. Lippman - Sound Development Recommended Age of Acquisition
For Phonemes (Sounds) and Clusters
Phoneme (Sound) Females Males
/m/ 3 3
/n/ 3.6 3.0
/-ng/ 7.0-9.0 7.0-9.0
/h-/ 3.0 3.0
/w-/ 3.0 3.0
/y-/ 4.0 5.0
/p/ 3.0 3.0
/b/ 3.0 3.0
/t/ 4.0 3.6
/d/ 3.0 3.6
/k/ 3.6 3.6
/g/ 3.6 4.0
/f/ /f-/ 3.6 3.6
/-f/ 5.6 5.6
/v/ 5.6 5.6
/th/ unvoiced 6.0 8.0
/th-/ voiced 4.6 7.0
/s/ 7.0-9.0 7.0-9.0
/z/ 7.0-9.0 7.0-9.0
/sh/ 6.0 7.0
/ch/ 6.0 7.0
/j/ 6.0 7.0
/l/ /l-/ 5.0 6.0
/-l/ 6.0 7.0
/r/ /r-/ 8.0 8.0
/-er/ 8.0 8.0
Word-initial Clusters
/tw kw/ 4.0 5.6
/sp st sk/ 7.0-9.0 7.0-9.0
/sm sn/ 7.0-9.0 7.0-9.0
/sw/ 7.0-9.0 7.0-9.0
/sl/ 7.0-9.0 7.0-9.0
/pl bl kl gl fl/ 5.6 6.0
/pr br tr kr gr fr/ 8.0 8.0
/thr/ 9.0 9.0
/skw/ 7.0-9.0 7.0-9.0
/spl/ 7.0-9.0 7.0-9.0
/spr str skr/ 7.0-9.0 7.0-9.0

*From p.795 Table 7. Iowa-Nebraska Articulation Norms