Disordered or delayed language
The various aspects of language usually develop in an orderly way.
Children generally learn certain sounds, words sentences before others. Language is usually described as ‘delayed’ when they continue to make the common mistakes of early development and when their language is developing slowly in the usual order of language development.
The language of children who make rare mistakes or whose language is developing in an unusual way is called ‘disordered’.
Assessment by a speech and language therapist is required for the distinction to be made reliably.