Yep, for us it was very sudden! One day about 3 weeks ago, DD, who is 16 months too, just started trying to copy everything I said, and she will give everything a go, whereas the day before she used to just look at me blankly! I say "can you say milk?" and she will say "ulk", and "can you say block", and she goes "ock"... She tries names, everything. Most things don't sound all that spot on, but I know what she means. She now has a few more favourites that she says over and over. But it was really sudden, one day nothing except mumma and dadda and woof, and now she is saying "oopdedaidy" (oopsiedaisy) and I can't shut her up!!

Wait for it, it will happen very soon I am sure