Hello! We are the new owners of two female pigs around 6 wks old - Petunia and Marabel. We are starting to wonder if Marabel is really a dude. Watching her walk around, she appears to be developing "butt cheeks"; Petunia does not have this although she seems to be slower to gaining weight and confidence compared to Marabel. We are having trouble based on inspecting the genitals. I have attached a picture. Any help is appreciated. Thanks!!!