Greets Livvy! welcome to the forums, and to MCN!

I don't think there's any style for boys or girls, it's more around the fit of the nappy on the child.
Nappies like Baby Beehinds fitteds have inserts that you fold to the area that's needed, and as the boy bits point down (always point them down in a nappy!) I've folded my inserts to be 3 layers thick in the crotch.

My biggest tip would be to buy some nappies second-hand, all different sorts, until you find a style that suits your bub - and as they grow, be prepared to try different types all the time! By buying second-hand, its not a huge outlay for something that may not suit, and you can then buy the best fits new.

Good luck!