twinkle--from the research I've done, I don't think there is such thing as a teacup maltese. I read that maltese are mostly in the 4-6 lbs. range but there are some that go up to 7 lbs. and some at 3lbs. Mine is estimated to be 3lbs and yes he is a maltese.
I can't wait to bring him home with me--they are keeping him because he's so tiny. They want to make sure he's eating enough and not having diarrhea. I asked if he's had any problems as of yet and they said no so he'll probably be ready to come home with me by Friday.