These abbreviations are especially problematic for me, as my daughter refers to her younger brother as "d�d�"

http://www.standardmandarin.com/chinesephrases/Little%20Brother

Every time I read "DD" I think "d�d�", and picture a little boy.

So, you wont often see me use these abbreviations, and if I accidentally refer to anyone's DD as a boy, I apologize in advance.