
Zach Plante is close with his parents — he plays baseball with them and, on  weekends, helps with work in the small vineyard they keep at their northern  California home.
Lately, though, his parents have begun to notice subtle changes in their son.  Among other things, he's announced that he wants to grow his hair longer — and  sometimes greets his father with "Yo, Dad!"
 "Little comments will come out of his mouth that have a bit of that teen  swagger," says Tom Plante, Zach's dad.
 Thing is, Zach isn't a teen. He's 10 years old — one part, a fun-loving  fifth-grader who likes to watch the Animal Planet network and play with his dog  and pet gecko, the other a soon-to-be middle schooler who wants an iPod.
 In some ways, it's simply part of a kid's natural journey toward  independence. But child development experts say that physical and behavioral  changes that would have been typical of teenagers decades ago are now common  among "tweens" — kids ages 8 to 12.
 Some of them are going on "dates" and talking on their own cell phones. They  listen to sexually charged pop music, play mature-rated video games and spend  time gossiping on MySpace. And more girls are wearing makeup and clothing that  some consider beyond their years.
 Zach is starting to notice it in his friends, too, especially the way they  treat their parents.
 "A lot of kids can sometimes be annoyed by their parents," he says. "If I'm  playing with them at one of their houses, then they kind of ignore their  parents. If their parents do them a favor, they might just say, 'OK,' but not  notice that much."
 The shift that's turning tweens into the new teens is complex — and worrisome  to parents and some professionals who deal with children. They wonder if kids  are equipped to handle the thorny issues that come with the adolescent  world.
 "I'm sure this isn't the first time in history people have been talking about  it. But I definitely feel like these kids are growing up faster — and I'm not  sure it's always a good thing," says Dr. Liz Alderman, an adolescent medicine  specialist at Montefiore Medical Center in New York City. She's been in practice  for 16 years and has noticed a gradual but undeniable change in attitude in that  time.
 She and others who study and treat children say the reasons it's happening  are both physical and social.
 Several published studies have found, for instance, that some tweens' bodies  are developing faster, with more girls starting menstruation in elementary  school — a result doctors often attribute to improved nutrition and, in some  cases, obesity. While boys are still being studied, the findings about girls  have caused some endocrinologists to lower the limits of early breast  development to first or second grade.
 Along with that, even young children are having to deal with peer pressure  and other societal influences.
 Beyond the drugs, sex and rock'n'roll their boomer and Gen X parents  navigated, technology and consumerism have accelerated the pace of life, giving  kids easy access to influences that may or may not be parent-approved. Sex,  violence and foul language that used to be relegated to late-night viewing and  R-rated movies are expected fixtures in everyday TV.
 And many tweens model what they see, including common plot lines "where the  kids are really running the house, not the dysfunctional parents," says Plante,  who in addition to being Zach's dad is a psychology professor at Santa Clara  University in California's Silicon Valley.
 He sees the results of all these factors in his private practice  frequently.
 Kids look and dress older. They struggle to process the images of sex,  violence and adult humor, even when their parents try to shield them. And  sometimes, he says, parents end up encouraging the behavior by failing to set  limits — in essence, handing over power to their kids.
 "You get this kind of perfect storm of variables that would suggest that,  yes, kids are becoming teens at an earlier age," Plante says.  
Natalie Wickstrom, a 10-year-old in suburban Atlanta, says girls her age  sometimes wear clothes that are "a little inappropriate." She describes how one  friend tied her shirt to show her stomach and "liked to dance, like in rap  videos."  
Girls in her class also talk about not only liking but "having relationships"  with boys.  
"There's no rules, no limitations to what they can do," says Natalie, who's  also in fifth grade.  
Her mom, Billie Wickstrom, says the teen-like behavior of her daughter's  peers, influences her daughter — as does parents' willingness to allow it.  
"Some parents make it hard on those of us who are trying to hold their kids  back a bit," she says.  
So far, she and her husband have resisted letting Natalie get her ears  pierced, something many of her friends have already done. Now Natalie is  lobbying hard for a cell phone and also wants an iPod.  
"Sometimes I just think that maybe, if I got one of these things, I could  talk about what they talk about," Natalie says of the kids she deems the  "popular ones."  
It's an age-old issue. Kids want to fit in — and younger kids want to be like  older kids.  
But as the limits have been pushed, experts say the stakes also have gotten  higher — with parents and tweens having to deal with very grown-up issues such  as pregnancy and sexually transmitted diseases. Earlier this year, that point  hit home when federal officials recommended a vaccine for HPV — a common STD  that can lead to cervical cancer — for girls as young as age 9.  
"Physically, they're adults, but cognitively, they're children," says  Alderman, the physician in New York. She's found that cultural influences have  affected her own children, too.  
Earlier this year, her 12-year-old son heard the popular pop song  "Promiscuous" and asked her what the word meant.  
"I mean, it's OK to have that conversation, but when it's constantly playing,  it normalizes it," Alderman says.  
She observes that parents sometimes gravitate to one of two ill-advised  extremes — they're either horrified by such questions from their kids, or they  "revel" in the teen-like behavior. As an example of the latter reaction, she  notes how some parents think it's cute when their daughters wear pants or shorts  with words such as "hottie" on the back.  
"Believe me, I'm a very open-minded person. But it promotes a certain way of  thinking about girls and their back sides," Alderman says. "A 12-year-old isn't  sexy."  
With grown-up influences coming from so many different angles — from peers to  the Internet and TV — some parents say the trend is difficult to combat.  
Claire Unterseher, a mother in Chicago, says she only allows her children —  including an 8-year-old son and 7-year-old daughter — to watch public  television.  
And yet, already, they're coming home from school asking to download songs  she considers more appropriate for teens.  
"I think I bought my first Abba single when I was 13 or 14 — and here my  7-year-old wants me to download Kelly Clarkson all the time," Unterseher says.  "Why are they so interested in all this adult stuff?"  
Part of it, experts say, is marketing — and tweens are much-sought-after  consumers.  
Advertisers have found that, increasingly, children and teens are influencing  the buying decisions in their households — from cars to computers and family  vacations. According to 360 Youth, an umbrella organization for various youth  marketing groups, tweens represent $51 billion worth of annual spending power on  their own from gifts and allowance, and also have a great deal of say about the  additional $170 billion spent directly on them each year.  
Toymakers also have picked up on tweens' interest in older themes and  developed toy lines to meet the demand — from dolls known as Bratz to video  games with more violence.  
Diane Levin, a professor of human development and early childhood at Wheelock  College in Boston, is among those who've taken aim at toys deemed too violent or  sexual.  
"We've crossed a line. We can no longer avoid it — it's just so in our face,"  says Levin, author of the upcoming book "So Sexy So Soon: The Sexualization of  Childhood."  
Earlier this year, she and others from a group known as the Campaign for a  Commercial-Free Childhood successfully pressured toy maker Hasbro to drop plans  for a line of children's toys modeled after the singing group Pussycat Dolls.  
Other parents, including Clyde Otis III, are trying their own methods.  
An attorney with a background in music publishing, Otis has compiled a line  of CDs called "Music Talking" that includes classic oldies he believes are  interesting to tweens, but age appropriate. Artists include Aretha Franklin,  Rose Royce and Blessid Union of Souls.  
"I don't want to be like a prude. But some of the stuff out there, it's just  out of control sometimes," says Otis, a father of three from Maplewood, N.J.  
"Beyonce singing about bouncing her butt all over the place is a little much  — at least for an 8-year-old."  
In the end, many parents find it tricky to strike a balance between setting  limits and allowing their kids to be more independent.  
Plante, in California, discovered that a few weeks ago when he and Zach rode  bikes to school, as the two of them have done since the first day of  kindergarten.  
"You know, dad, you don't have to bike to school with me anymore," Zach said.   
Plante was taken aback.  
"It was a poignant moment," he says. "There was this notion of being  embarrassed of having parents be too close."  
Since then, Zach has been riding by himself — a big step in his dad's mind.  
"Of course, it is hard to let go, but we all need to do so in various ways  over time," Plante says, "as long as we do it thoughtfully and lovingly, I  suppose."  
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On the Net:  
Campaign for a Commercial-Free Childhood: http://www.commercialfreechildhood.org