My dd is almost 2 & a half and she is also a great communicator. She strings full sentences together and pronounces words clearly. But she also lately has started talking "baby babble". If its directed at me I just ask her to use her words because mummy cant understand her. I think it must be the age where they experiment, copy things they've seen. She is very into imaginative play and sometimes crawls on the ground after telling me she is a baby! At times I think its her way of having some cuddly attention too. I'll go along with her role playing then the next min she is a toddler again. Im sure they outgrow it.