Children learn to say what they think they are hearing. Sometimes those utterances seem strange to adults but they are the best that children can muster. Often those words that children use have a life of their own and can live into adulthood as part of the memory of growing up.
This book presents the word as the child said it, and then the adult word and a picture of what the word stands for. There is a space for the reader to write the word their child uses for the same concept. As as added feature, there is a cut-out from the image of the real word of the real real object as the background on the page where the reader is introduced to the word the child says. That cut-out is identified on the real image of the word. Can the reader guess what the full size object is by seeing a small part of it?