After reading (again) about FLA, I started paying more attention to my son's utterances. He can definitively understand more than what he actually produces. He is in the 'two-word stage' and he can communicate with phrases like: 'Yes, please' or 'Thank you, mom'. Besides, I enjoy listening to him while he tries to produce a new item that calls his attention. He's so cute! I cannot help talking to him in a motherese way!