Getting a stubborn toddler or preschooler to forsake his high-octane juice and Pop-Tarts for more wholesome choices may seem hopeless task. But it's well worth the effort. Food and fitness habits are formed early, so that this is actually your best window of opportunity to effectively help your overweight child. If you get your child to practice healthy lifestyle habits in her early years, by the time she hits the tumultuous teen years and decides you don't know or understand anything, she'll be better equipped to make good choices independently.