Sound/Phonological errors are a common developmental occurrence that usually pass with time and practise. A phonological disorder is characterised by the production of predictable and systematic sound errors that persist beyond the age when most children have stopped making them. These errors can make it difficult for people with a phonological disorder to be understood by others. 

If you are concerned that your child may have a phonological disorder, it is important to talk to your GP or a speech-language therapist. They can assess your child's speech and help you determine if there is a problem.