And I don't mean cocaine and such illegal drugs.
Read this story.
http://www.thesun.co.uk/sol/homepage...years-old.html

A girl that young shouldn't have the hormones present in her body that would allow her uterus and ovaries to be functional. Only some kind of exposure to hormone treatment or other chemicals that might stimulate puberty could accomplish that. My though is it has to do with drinking water being polluted with industrial and/or medical chemicals, due to poor environmental regulations in Mexico.