Speech milestones are guidelines for when children should pronounce different sounds and for how clear their speech should be. Children typically pronounce the following English consonant sounds by age 3: m, n, h, p, w, d, b, f, k, g, “ng” (as in “ring”). They pronounce the following by age 4: y, t, s, l, sh. By age 5 they pronounce: ch, z, r, z, j, v. By the age of 7, children typically produce all English consonants. Intelligibility is a perceptual judgment that is based on how much of the individual’s speech the listener understands. It can vary from “intelligible”, meaning the message is completely understood, to “unintelligible”, meaning none of the message is understood. Children’s speech should be approximately 25% understandable to unfamiliar listeners by age 1 year, 50% by age 2 years, 75% by age 3 years, and 100% by age 4 years. Familiar listeners (e.g., parents, caregivers, siblings) can often understand a higher percentage of what the child says than unfamiliar listeners. Children also simplify their speech in a patterned nature, called “phonological processes”. For example, children often produce consonant clusters as a single consonant so that a word like “plane” becomes “pane”. These phonological processes typically disappear between the ages of 3 and 5.
Language milestones are guidelines for development of understanding and use of language, including vocabulary, syntax, grammar, and social skills. The following chart details some of the language skills your child should demonstrate according to his or her age.
Age |
Language Skills |
6-11 months |
|
1 year |
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2 years |
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3 years |
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4 years |
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5 years |
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American Speech-Language-Hearing Association (2020). Speech sound disorders-Articulation and phonology.
https://www.asha.org/PRPSpecificTopic.aspx?folderid=8589935321§ion=Assessment
Bowen, C. (2018). Table 1: Intelligibility.
http://www.speech-language-therapy.com/
Centers for Disease Control and Prevention (2020). CDC’s developmental milestones. https://www.cdc.gov/ncbddd/actearly/milestones/index.html
Lanza, J., & Flahive, L. (2008). Guide to communication milestones. East Moline, IL: LinguiSystems.
https://speechhearing.columbian.gwu.edu/sites/g/files/zaxdzs1996/f/downloads/Milestonesguide.pdf
McLeod, S., & Crowe, K. (2018). Children's consonant acquisition in 27 languages: A cross-linguistic review. American Journal of Speech-Language Pathology, 27(4), 1546-1571.
https://doi.org/10.1044/2018_AJSLP-17-0100