Language aquisition is my strong point so I'll help as much as I can
Phonology - talk about consonant clusters, reduplication,deletion, substitution which are for articulatory ease. Perhaps link this to Berks and Browns wug test
Grammar - stage so usually telegraphic/ post telegraphic. Provide examples of content words which illustrate they're in the telegraphic stage and function words for the post telegraphic.
Virtuous errors which is a verb inflection- link this to Chomsky
Semantics - look for over extensions and under extensions. Link to Rescorla categorical, anological or miscue
Lexis - monosyllabic/ polysyllabic/ exaggerated look at how parents use it. If it's simple, perhaps this is for child directed speech - Bruner
Any regional dialect influencing language
Gender/ power links - genger (women use tag questions, superlatives)- link to Lakota politeness strategies
Fathers- imperatives some times mothers too - demonstrated instrumental power- Waerings theory