punkin said:It may be common, but I cannot agree that it is "normal"
It is VERY normal to start puberty at age 8 or 9. Starting puberty doesn't mean you get your period then, usually that comes about 3 years after you start puberty. An 8 year old starting puberty would get their period around age 11.
Here is a great link that shows all the stages of puberty and average ages of onset. http://www.puberty101.com/p_pubgirls.shtml
There were plenty of girls when I was in 6th grade that had their periods so an 8 year old starting puberty isn't new. Almost all the girls had their periods by the end of 7th grade, which is 12/13 years old.