Health risk or hysteria ? Experts are n't sure what 's behind the increase in earlier puberty . Studies showed girls who started puberty earlier at greater risk for certain cancers . Comment: Chemicals such as bisphenol-A ( BPA ) may affect hormones .
Experts are n't sure what 's behind the increase in earlier puberty . Studies showed girls who started puberty earlier at greater risk for certain cancers . Comment: Chemicals such as bisphenol-A ( BPA ) may affect hormones .