For whole-grain carbs, such as brown rice or pasta, a serving is roughly the size of his fist -- a measurement that also applies to fruits, veggies, and dairy products such as yogurt. A serving of cheese is about thumb-size, and for munching on snack foods, think a handful. "The great thing about this system is that it works no matter what your child's age -- because his hand grows as he, and his appetite, does. So you don't have to memorize portions," Dr. Hampl notes.
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