My 7yo has been really hard on her jeans! I guess she is just at that age. I also catch her crawling around on the floor playing with her younger sisters a lot. Whatever the cause, she is wearing holes in the knees of all of her jeans! Some of them I just bought her a few months ago! Grrr! I did get her another pair, but I don't want to keep buying jeans because soon it will be "shorts weather" and surely by next school year she will jump up another size.
So, for now, I mended them. I am not usually that great at mending jeans. When we first got married I tried to mend my husband's jeans and the (ugly) patches fell off the first time he wore them. This time, I decided to try out a couple of different techniques and see what was easiest/cutest/holds up the best.