What is assimilation in speech therapy?

When one sound in a word changes to match another sound in the same word. "Dog" becomes "gog" because the D changes to match the G. Also called consonant harmony. Example: "Dog" becomes "gog" (the "d" changes to match the "g").

🔄Phonological Processes

Assimilation

What is assimilation in speech therapy?

When one sound in a word changes to match another sound in the same word. "Dog" becomes "gog" because the D changes to match the G. Also called consonant harmony.

Example

"Dog" becomes "gog" (the "d" changes to match the "g").

🔊 Child saying "gog" instead of "dog"

📅 Typical Timeline: Usually resolves by age 3

How can I help my child with assimilation?

Clear, isolated vehicle sounds help children hear the distinct sounds in each word.

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About this guide: This glossary is designed to help parents understand speech therapy terminology. Definitions are simplified for clarity and informed by resources from the American Speech-Language-Hearing Association (ASHA).

Not medical advice: This information is educational only. For concerns about your child's speech development, consult a licensed speech-language pathologist (SLP).Find an SLP near you →

Learn More From Trusted Sources

ASHA: Speech & Language Development Chart— Official milestones by age
ASHA: Late Blooming or Language Problem?— When to seek help
Identify the Signs— ASHA's early intervention resource

Parents Also Ask

What is assimilation in speech?▼

Assimilation (or consonant harmony) is when one sound in a word changes to match another sound. "Dog" → "gog" (D becomes G), "cup" → "pup" (C becomes P). The child makes both consonants the same.

When does assimilation go away?▼

Assimilation typically resolves by age 3. If your child still uses consonant harmony after age 3, consider evaluation. It's one of the earlier patterns to disappear.

"I got to use Little Wheels and I love it — it's engaging and fun for therapy."

Brandi Keith, M.S. CCC-SLP — Speech-Language Pathologist

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Related Terms

Phonological Process

A predictable pattern children use to simplify adult speech. Fronting, stopping, gliding—these are all normal and disappear by certain ages. Only a concern if they persist too long.

More Phonological Processes

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Fronting Backing Gliding Stopping Cluster Reduction Final Consonant Deletion

Learn More About Speech Development

Late Talker App Guide: What Actually Works Speech Therapy at Home Guide 8 Ways to Practice Speech at Home 100+ Vehicle Sounds for Practice

Explore our parent guides for more speech development resources.

Support Your Child's Speech Development

Little Wheels apps use vehicle-based learning to make speech practice engaging and fun. Perfect for home practice between therapy sessions.

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