Onset of puberty in girls has fallen by five years since 1920

No one is sure what is causing the change

Menarche - an overview

Biology, Page 232 of 308, Science

Schematic picture of postnatal height and the three partly

Puberty in Girls

Children From Poor Families Show Signs Of Puberty Faster; Health Risks Of Early Development

With puberty starting earlier than ever, doctors urge greater awareness and care

Helping Your Tween Through Delayed Puberty

One Family's Battle to Avoid Added Hormones – Five Star Home Foods

Precocious puberty in girls comes with mental health risks