Pic one

is the black on just all black ?

Yes it's all black with the letter v in white with a white circle

This one. Since you don't know the sex. The others I feel or see them being more for the gender like the black one for a boy and then the purple one a girl.

This one

either one hun black goes great on a girl or boy just buy a white bow and a white hat and what ever comes out just put it on 😊

Thanks guys