Language Development across the Life Span: A Neuropsychological/Neuroimaging Perspective

Table 1

Acquisition of phonemes in English (adapted from Sander, [21]).

Phonemes	Age at which 50% produced the sound	Age at which 90% produced the sound
/p/, /m/, /h/, /n/, /w/	1 year	3 years
/b/	1 year	4 years
/k/, /g/, /d/	2 years	4 years
/t/, /ŋ/	2 years	6 years
/f/	2.5 years	4 years
/r/, /l/	3 years	6 years
/s/	3 years	8 years
/t∫/, /∫/	3.5 years	7 years
/z/	3.5 years	8 years
/j/	4 years	7 years
/v/	4 years	8 years
/θ/	4.5 years	7 years
/ð/	5 years	8 years
/ʒ/	6 years	8.5 years