Sounds that are less common will occur in a more restricted set of positions in a syllable or word. Acquisition of sounds Uncommon sounds are mastered later than the more common sounds. Sound change Less common sounds tend to be less stable than common sounds and are more susceptible to change. Substantive universals posit that every human language will have certain features or sounds. For example, all languages distinguish vowels from consonants.
All languages also have at least one stop consonant.
For further study on phonology Anderson, Stephen R. 1985. Phonology in the twentieth century. Burquest, Donald and David Payne. Chomsky, Noam and Morris Halle. The sound pattern of English.