My youngest DD also will often echo new vocab and phraseology, and repeats what she has heard in appropriate ways soon after hearing. She also asks really weird questions that she knows the answer too - I'll pick her up from daycare and she'll run over telling everyone she passes "It's my mummy, my mummy is here!" And then as we walk out holding hands she will say to me "Are you my mummy?" She verbalizes every thought she ever has (well it feels like every thought, though it probably isn't), often making quite simple statements, but its quite enchanting how she so clearly and simply describes her world in a non stop series of comments or questions. It seems to be part of her way of integrating and/or verifying everything.
