Well I am 14 and when I was around 9 or 10 I had a growth spurt and my thighs got bigger and my breast did too. I have stretch marks on my thighs and breasts. I weigh 107 and I'm trying to lose some weight, so I can have a flat stomach. I use coco butter the one with a pregnant women on the front and its specifically for stretch marks. It smells really good too. Just with in a few days they were way lighter! And I hope with me losing weight they will get smaller too. I don't really know about what to do with my breasts though.