Sources
Ages come from a review of 15 studies covering 18,907 children who speak English in the United States. Speech
development varies from child to child; this chart is general information, not a diagnosis.
- Crowe, K., & McLeod, S. (2020). Children’s English consonant acquisition in the United States: A review. American Journal of Speech-Language Pathology, 29(4). doi.org/10.1044/2020_AJSLP-19-00168
- McLeod, S., Crowe, K., & Shahaeian, A. (2015). Intelligibility in Context Scale: Normative and validation data for English-speaking preschoolers. Language, Speech, and Hearing Services in Schools, 46(3), 266–276. doi.org/10.1044/2015_LSHSS-14-0120