What does the doctor look for when doing....

I always hear these stories about school/pediatrician examinations where the doctor will lift the waistband of the young woman's panties to visually check for development. I've always wondered what exactly they are looking for? The only thing i can think of is pubic hair growth but wasn't sure if that's what they are looking for or if its something else?

Without detailed examination, they are looking for pubic hair growth and distribution. Those are indicators of stages of sexual development.

Puberal signs, how much hais and distribution.