Why is puberty coming earlier for girls today?

Everyone who's been through puberty knows it can be tough. But what if the changes started early -- say at about age 6 or 7? Why are many girls starting puberty so young?

Why is puberty starting younger?, World news

How Girls Are Developing Earlier In An Age Of 'New Puberty' : Shots - Health News : NPR

What are emotional changes in adolescence?

YOUR BLACK BEAUTY: RECOGNITION DESERVED AND DENIED

Did your child hit early puberty? Stop believing these 5 myths

Puberty In Girls: Causes, Signs, Stages And Duration

Will girls always go through puberty before boys?

What types of hormones are changing during puberty?

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