Linea nigra

Desiree • Dahlia 03/28/15💛 Frankie 03/22/19🧡 FJI7617🫀

Just curious, does anyone know why some women get the linea nigra and others don’t? I never got it with my daughter and I’m now 31 weeks with my baby boy and I haven’t gotten it. One of my closest friends got it with her first and it never went away. I know it doesn’t hold any significance on the health of the baby but I’m just wondering why some do and some don’t.