2. Phonological disorder : Symptoms
The symptoms of phonological disorder differ significantly depending on the age of the child. It is often difficult to detect this disorder, as the child with phonological disorder develops speech...
Healthline.com (OMS Preferred Provider)

3. Phonological Disorder Symptoms & Treatment
Children with phonological disorder do not use some or all of the speech sounds expected for their age group.
www.christusschumpert.org