Dr Sigman, whos reported was commissioned by Clearasil, said it was important for parents to be aware that puberty might arrive early for their daughters, and to try to talk to them in advance about the changes they would experience.

BBC: NEWS | Health | Stress 'fuelling early puberty'

Sigman 's Cingular, the biggest U.S. wireless firm, was first in the U.S. to sell popular phones such as Motorola's Razr, it's lagging rivals such as Verizon Communications and Sprint Nextel in its plans to build its high-speed network.

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