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"Experts aren't sure what's behind the increase in earlier puberty, but it's likely due to a combination of factors, including the childhood obesity epidemic and substances in the environment.As for what's causing the increasing in early puberty, chemicals in the environment, obesity, and above-average weight gain during infancy are all being considered as possible factors.
Early puberty in girls is a growing public health concern because studies have shown that girls who start puberty earlier are more likely to develop breast and uterine cancer later in life ...
Early development in girls has been linked with poor self-esteem, eating disorders, and depression, as well as cigarette and alcohol use and earlier sexual activity."
Comment: For a more in depth look at the environmental and health related causes of early puberty in young girls read the following articles:
Study: More U.S. Girls Starting Puberty Earlier Than Ever
Average Age of Girls Starting Puberty Falls Below 10
Puberty in Girls Hastened by Harmful Chemicals
Girls entering puberty by the age of six - but are drugs the answer?
The teen gene: Switching on puberty
Puberty Hitting Girls as Young as 4 Years Old
Vaccine Exposures to Thimerosal (Mercury) & Premature Puberty