Types of Speech Delays: Articulation vs Phonological Delays
Many parents notice that their child’s speech sounds different from other children their age. You may understand your child well, but unfamiliar listeners may struggle.
Two common types of speech differences are articulation delays and phonological delays.
Understanding the difference can help families better understand what support may look like.
What Is an Articulation Delay?
An articulation delay occurs when a child has difficulty physically producing a specific speech sound.
For example, a child may:
Produce a lisp on “s” or “z”
Allow lateral release of sounds such as sh, ch, j, s and z. This articulation tends to make the sounds sound slushy or as if there is excessive saliva.
In articulation difficulties, the child often makes the same sound error consistently.
This may relate to:
Tongue placement
Jaw stability
Motor planning
Oral awareness
Learning how to coordinate speech movements
Speech therapy for articulation often focuses on helping children learn accurate sound placement and movement patterns.
What Is a Phonological Delay?
A phonological delay is different.
In phonological delays, children have difficulty understanding and using the rules of the sound system. The errors can be identified in patterns of substitutions.
For example, a child may:
Say “tat” instead of “cat” (fronting)
Leave off sounds in words (“ca” for “cat”)
Simplify clusters (“poon” for “spoon”)
Substitute groups of sounds consistently
Children with phonological delays often know how to physically make the sounds but are using patterns that simplify speech.
Why Does the Difference Matter?
Understanding whether a child has an articulation or phonological delay helps guide therapy.
Different approaches are often needed.
Speech pathology assessments help identify:
Which sounds are affected
Whether the difficulty is motor-based or rule-based
Which speech patterns are developmentally expected
Whether support is recommended
Can Children Have Both?
Yes.
Some children present with both articulation and phonological differences.
A comprehensive speech assessment helps create an individualised therapy plan based on your child’s strengths and needs.
When Should I Seek Support?
You may wish to seek a speech pathology assessment if:
Your child is difficult to understand
Speech differences are impacting confidence
Teachers or educators have concerns
Your child becomes frustrated communicating
Speech errors are persisting beyond expected developmental ages
Early support can help improve intelligibility, confidence, literacy foundations, and participation in everyday communication.