C doesn't stop talking - just in the last month he's really started copying everything you say - we have Daddy, Nana, Muma, Asda, tractor, car, moon, star, teeth, tea, cooker, clock, cat, round (as in round and round), swish, slipper, sock, shoe and probably others I can't think of.
MQ - I tend to take it as word if it's said in context, not just copied, and is fairly obvious, even if we don't get the full word.