As their language develops it's an incredibly exciting time for both you and your child. Their world becomes more accessible and their ability to understand it becomes easier simply because they can now ask questions about it thanks to her rapidly expanding vocabulary.
Rhyme plays a major part in speech development as it helps children understand the pattern and rhythm of speech -- how it works and fits together. And of course, children love repetition! As they become familiar with a rhyme you'll find they are itching to show you that they know what the next rhyming word will be.