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Like many year-old girls, Lindsay Kendrick likes to play sports and attend camp during Young girls hitting puberty summer. And like a growing number of girls her age, Lindsay Young girls hitting puberty hit early puberty very early. Lindsay's mother, Beth, said her daughter first started menstruating when she was only 9. Kendrick took Lindsay to her pediatrician, who told Beth that early puberty is much more common now, and said that Lindsay's period would probably start sometime in the next year.

A new study published in the journal Pediatrics may help lay the groundwork for future research that determines why, as past research has shown, more girls may be entering puberty early.

In the study, researchers assessed more than 1, 6- to 8-year-old girls in three metropolitan areas for breast development and the appearance of pubic hair, both signs of early puberty.

The research showed that by using these methods, scientists may be able to determine more accurately what factors could lead to early puberty in girls. Richard Besser, however, that determining early puberty was not the focus of the research.

The authors point out that the study does not use a nationally representative sample of subjects, and does not look at development over time to account for environmental exposure, dietary differences or other factors related to race and ethnicity.

Additionally, some subjects were selected because they had existing risks for early puberty. Another important element missing from this Young girls hitting puberty is information about the onset of menstruation, which could indicate whether puberty has actually started. But pediatricians said past research suggests puberty may, indeed, be striking earlier than the to year-old age range that the National Institutes of Health set as the norm for girls. Past research has shown a steady decrease in the age that children -- specifically girls -- are hitting puberty.

Evidence first surfaced in a study published in the journal Pediatrics in April In that study, researchers found that the average age for breast development or the growth of pubic hair was 9. A number of subsequent studies have shown similar results -- that girls are "growing up" at younger and younger ages.

So far, there's been no clear, singular explanation as to exactly why this is happening. One theory suggests girls' exposure to estrogens and other organic pollutants in the environment could be providing the early trigger that sets puberty into motion.

There are hypotheses that bisphenol A, or BPA in the environment could be triggering early puberty. Other environmental toxins which are believed to have an impact on pubertal age are parabens -- preservatives found in shampoos and other cosmetic products -- and phyoestrogens found in plants.

The authors of the current study concur. They wrote "[v]ariations in the timing of pubertal maturation may be sensitive 'sensors' of the effects of environmental exposure in human populations," and are in fact in the first year of a study looking whether environmental factors cause Young girls hitting puberty puberty.

Another theory places blame on the growing epidemic of obesity among children because fat tissue is known to produce estrogen. But that theory raises questions of its own. One study seemed Young girls hitting puberty suggest that a stressful family environment may cause puberty to kick in early for young girls. And inyet another study found a gene mutation that could be responsible for a small number of these cases.

Occasionally, precocious puberty can be the result of a tumor or other problem in the brain, or a brain injury or infection; these cases, however, are rare. There are also endocrine disorders that can cause early puberty, including thyroid disease, polycystic ovarian Young girls hitting puberty and others. Experts have conflicting opinions about whether or not this study will redefine what is normal in terms of Young girls hitting puberty puberty.

According to Budzak, a new definition of normal can have huge treatment and evaluation implications. Experts do agree that finding the cause for early puberty is important because of potential health concerns and developmental issues in the future. Early puberty may also hit Young girls hitting puberty hard, too, as Beth Kendrick can attest. All rights reserved. Before Giuliani, Ukrainian official hired Trump-linked lobbyist to relay Biden claims.

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