However, due to incomplete maturation in the intergestural coordination, the constrictions end up being produced concurrently at the beginning of the word. As the jaw raises for the initial coronal, the lips may constrict, even though the UL and LL have not reached their fully displacement from teeth and jaw. Effect will be particularly pronounced in initial position, because the jaw is raised highest at the beginning of a word. High jaw plus partial displacement of UL and LL from their neutral positions will result in a lip constriction, in addition to a tongue tip constriction at the beginning of the word. The correspondence between adult form and child form is quite variable in terms of a rule operation to take adult form to child form.
Generalization is that child form is constrained to a particular template.
In general, coronal stops follow non-coronal stops in such templates. Child underlying representations are mostly identical to adult representations. For production , a given underlying form is given and surface pronunciation candidates compete. For perception , a pronounced form is given, and underlying lexical representations compete. Faithfulness constraints will now determine the winner.