Got a kid who's turning into a picky eater -- or a couch potato, video-game addict, or schoolwork slacker -- right before your eyes? Hoping it's just a phase?

Do more than hope. "The world is full of good kids," says RealAge pediatric expert Jennifer Trachtenberg, MD, "but modern life invites unhealthy habits. At first they're easy to ignore, but too often, small choices turn into big problems down the road." So step in early. How? Start with these four steps from Dr. Jen's tip-filled new book, Good Kids, Bad Habits: The RealAge Guide to Raising Healthy Children.

Dr. Jen helps you get a handle on your kids' habits and health with four highly effective strategies:

1. Identify any trouble spots: Start by taking the RealAge Healthy Kids Test.
2. Pinpoint your parenting style: Use the Parenting Style Quiz to find out if you're a pushover or a drill sergeant.
3. Find parenting pals: Chat, vent, and share with others on the Parent Place message boards.
4. Stay on track: Keep your family happy and healthy with these checklists and charts.

For hundreds of specific tips on helping kids from 7 months to 17 years, delve into Good Kids, Bad Habits. In the words of one real-life mom, "The advice here is not gimmicky or instant-fix. It's solid, straightforward, and sane. It's also convincing." Here's a sneak peek at the table of contents: