Parents should care about this a lot and let them explain to handle discomfort of girls. Because they have much more responsibility on this issues. In schools also the syllabus modified a bit to explain more about it.
Theoretical knowledge only clear the doubts and elders advice somewhat show the methods to handle the things,But it's not that easy we have to adjust with the physical changes,pain,Mentality changes and the new social status as a big girl from a kid.It's very stressful for any girl and if it's happens in the very young then the stress level will be doubled.