I had one. It was *baaad*!!! You can't see em in the pic, but my belly button was *black* and I had the .Linea .Nigra from under my boobs to my vagina.
It doesn't have to do with the sex of your baba, it's just the type of heritage you are. I'm .Creole, so I was destined to have it. Here's 2 pics of my belly at like 28 weeks maybe...The 1st one is the top view, and the 2nd one is the underneath view.
It had *just* started getting dark! It was black(like my nipples) when I had .Oni and the months following. It didn't go away until .Oni was about 5 months. I had to literally scrub my belly button to get it off!!
sorry they're so big, I did it so you could see it clearly!
sarah