This study looked at articulation development in children between the ages of 2 and 4 years. The data is presented in the same way as the data in the previous chart, with the bar beginning at the average age of acquisition (50%) and ending at the upper limit of acquisition (90%). When an arrow points to the right, the age of upper limit of acquisition was some undetermined age above 4 years.
|from: Prather, E. M., Hedrick, D. L., & Kern, C. A., (1975). Articulation Development in Children Aged 2 to 4 Years. Journal of Speech and Hearing Disorders 40: 179-191.|
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