These charts show at what age 90 percent of girls and boys can articulate the English consonants correctly (in all word positions). Research indicated the developmental milestones for some consonants are different for girls and boys. Vowels are correctly produced by the age of three. All children do not develop at the same time and in the same way, so we cannot expect correct speech from every child in the primary grades.
r blends: between 6-0 to 8-0 s blends: between 7-0 and 7-11
Norming Sample: 1,175 girls matched with U.S. Census data for geographic region, race, ethnic group, age and mother's educational level.
l blends: between 6-0 to 8-0 r blends: 6-0 to 7-0 s blends: 8-0 to 8-11
Norming Sample: 1,175 boys matched with U.S. Census data for geographic region, race, ethnic group, age and mother's educational level.
Developmental data obtained from Goldman-Fristoe-2 Test of Articulation authored by Ronald Goldman, Ph.D., Macalyne Fristoe, Ph.D and Kathleen Williams, Ph.D. Published 2000