Wanna=want to
wanna+inf.
so it should be like this
I wanna have a girl
or just say
I want a girl

Personally, I would pick having a boy, just because I wouldn't want to worry about my daughter when she grows up. If its a boy, then its much more likely for him to take care of himself. Not to mention, growing up in a traditional family, I was raised with a sense of responsibility to pass on the family name.

I will not choose anyone!

what if he were so offensive and aggressive that he was likely to be a criminal?