The study, posted in the journal Human Reproduction, examined chemical amounts including phthalates, parabens and phenols.
Certain phthalates are applied in some scented solutions this sort of as perfumes, deodorants, soaps, shampoo, nail polish and cosmetics.
Parabens are normally utilised as preservatives in cosmetics and other personalized treatment solutions and phenols can be utilised in cleaning soap, toothpaste, lipsticks, hairsprays, shampoos and pores and skin lotions.
Scientists observed 179 women and 159 boys in California born to mothers pregnant among 1999 and 2000.
The group analyzed the degrees of chemicals in the moms in the course of being pregnant and in the kids at 9 a long time previous.
They then tracked onset of puberty and uncovered publicity to specific chemical compounds was linked to the early onset of puberty in ladies but no proof that chemical publicity impacted boys.
Direct researcher Dr Kim Harley, affiliate professor in general public well being at the University of California, explained they located two chemical compounds were being significantly significant.
“Mothers who had bigger ranges of two chemical substances in their bodies throughout being pregnant – diethyl phthalate, which is applied in fragrance, and triclosan, which is an antibacterial agent in selected soaps and toothpaste – had daughters who entered puberty before,” she claimed.
“We also observed that girls with larger levels of parabens in their bodies at the age of nine entered puberty earlier,” she included.
Dr Harley explained the review may possibly aid demonstrate why the age at which puberty starts off in girls has been receiving previously in the past number of a long time, which has destructive side results.
“1 speculation is that chemical compounds in the environment may be enjoying a function, and our findings assistance this idea,” she explained.
“Before puberty in girls boosts their hazard of mental well being troubles and chance-having conduct as youngsters and improves their risk of breast and ovarian most cancers about the very long-phrase, so this is an significant challenge to handle,” she included.