10/11/2025
Did you know that speech sound development follows a predictable pattern, but every child’s journey is unique?
Research by McLeod & Crowe (2018) reviewed speech development across 27 languages and over 26,000 children. They found that most Australian English speaking children:
Produce about 75% of consonants correctly by age 4
Produce about 90% of consonants correctly by age 5
Early sounds like p, b, t, d, m, n usually appear first, while fricatives, affricates, r, and “th” sounds tend to develop later.
Importantly, these are guidelines, not hard rules. Every child develops at their own pace, and variability is normal. Therapy should focus on sounds that matter for intelligibility, communication, and the child’s daily life. Choosing therapy targets based on the child’s unique profile is more meaningful than relying on age norms alone.
Full reference:
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