C section

For the women who has had a C section I am curious about something. When you were pregnant did you go through your pregnancy with no Stretch marks on your tummy tell you had to have a C section?

My sister went her whole pregnancy with no stretch marks and she says that it's because they did the c section why she has them now but she didn't keep or do anything the whole 9 months moisturizing her skin and she did gain weight!! So I'm Curious a lot and wanna see what everyone else experience with stretch marks and c section