Table 1: Acquisition of phonemes in English (adapted from Sander, [21]).

PhonemesAge at which 50% produced the soundAge at which 90% produced the sound

/p/, /m/, /h/, /n/, /w/1 year3 years
/b/1 year4 years
/k/, /g/, /d/2 years4 years
/t/, /ŋ/2 years6 years
/f/2.5 years4 years
/r/, /l/3 years6 years
/s/3 years8 years
/t/, //3.5 years7 years
/z/3.5 years8 years
/j/4 years7 years
/v/4 years8 years
/θ/4.5 years7 years
/ð/5 years8 years
/ʒ/6 years8.5 years