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Why are girls starting puberty earlier?

There is a growing pattern of children entering puberty at younger ages. Girls who begin menstruating earlier are at risk for more serious health conditions.

Girls' periods starting earlier and becoming more irregular, study finds

Girls have been getting their periods earlier and earlier for more than half a century. And as early onset increased, it has taken longer and longer for menstrual cycles to become regular. Both of those facts carry the possibility of health challenges as the girls get older.

Age of first period declines - could be obesity or pollution

A big US study has shown that the average age for girls' first period is now under 12 years old.

Kids are starting menstruation earlier, study shows. Here is what that means for their health

Starting menstruation is an important sign of health. A new study shows that the trend of children starting at an earlier age may point to worrying conditions.

Early Menstruation in Black Girls Linked to Socioeconomic Status