Liquids or glides may be substituted. Usually a glide is substituted for a liquid before the liquid is acquired. In the final position, liquids are usually omitted or replaced by vowels. Consonant clusters are usually acquired late. Gliding substituting a glide for a sound in another class.
Fricatives are the most common class replaced followed by sonorants .
Assimilations altering a phoneme so that it takes on a characteristic of another sound in the word or phrase due to the influence of that other sound.