In the articulation of a 4-year-old child, the phenomena related to speech ontogenesis overlap. A 4-year-old child articulates more phonemes than a 3-year-old, and at the same time some phonemes have not been mastered by him/her yet, and although these elements may appear occasionally, especially in certain, e.g. more difficult to produce phonological contexts, they are not yet acquired to the extent that would allow to talk about the completion of the acquisition process. This dynamics accompanying the development of the speech of a 4-year-old child and the overlapping of linguistic phenomena characteristic of the development of speech is the reason why in this age group there can be observed a higher rate of occurrence of different ways of implementing the same phonological contexts than in the younger and older population. This tendency is especially noticeable in the case of consonant groups that are difficult to articulate.
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