Zach (2;4) drawing a banana

Sumamry of activity, interaction and language development
Zach is trying to draw a banana, whilst his mother Halla is attempting to get him to engage in a conversation, to attempt to peruse into how much his language as developed. The father, Nick, briefly involved in the conversations as Zach demonstrates how to draw a banana. Eventually, Zach then goes onto reading a book, 'Busy Railway', just before his parents are about to have dinner.

Analysis
Something which is quite clear from the start is that Zach as already began to develop his own idiolect. He refers to his notepad as 'my little pad' , this his familiar term and he uses this term throughout the entier conversation - "where's my little pad gone?". Halla's reply of "where is your little pad?" invites conversation. Also the open question echoes the child so allows him to build on the familiarity that he has with the term "little pad" rather than simply "the book". This is a form of child-directed speech, the child-led discourse allows the child to talk more and is comfortable doing so. Open questions from his mother are evident throughout the conversation as she encourages him to converse more and expand his sentences. Children normally talk about local topics (things in their every day life) so utterances of words from their own idiolect should promote more pragmatic responses.
The use of both open and closed questions are used to generate a particular answer. for instance Halla says "3 things?" which in a way is a bit of both - not only does it invite more than just a "yes" or "no" answer, as it provides range. The question is also contextual so that Zach is able to build on what the "3 things" are. Zach responds with "here" and points at part of the drawing - the use of the paralinguistic feature is common with young children as it helps them to communicate even more efficiently.
Zach's use of the utterance "frough" instead of the standard utterance "through" helps generate evidence to the Fis phenomenon. The phenomenon states that as the child is not yet completely familiar with phonetics, children use simplification through substitution. It's clearly evident here as Zach believes he is saying "through" but "frough" is what is heard instead.
In addition, Zach calls 'bolognese', 'bolognay'. As he is not familiar with the word (which is the reason why he calls it lasagne - an example of overextension by category), he replaces the unstressed syllable with something that is easier for him.