• Fresh fruit cut into bite-sized pieces, including apple moons, sliced grapes, orange slices, and berries.
• String cheese or cheese slices
• Homemade snack mix.
  Combine plain cereals like oat circles with pretzels and goldfish crackers. Or you can tailor the mix to your child's favorites.
• Muffins.
  Package carrot or fruit muffins in individual plastic bags. Add miniature chocolate chips to a basic muffin recipe, such as bran or zucchini, to increase the appeal of the good-for-you ingredients. Add a few tablespoons of wheat germ or a handful of oats to any batter to increase its fiber content in an undetectable way. Toddlers especially like tiny-sized muffins.
• Granola bars.
  They're less fatty than a candy bar. Plus, your child will get more fiber while still satisfying a sweet tooth.
• Briefly steamed and cooled veggies, such as baby carrots and broccoli "trees," served with a yogurt dip.
• Cups of applesauce.
  Pick different flavors and blends for a satisfying low-fat source of fiber and vitamin C that tastes pleasingly sweet
• Snack cookies such as animal crackers, fig bars, graham crackers, gingersnaps, or vanilla wafers.
  These low-fat, low-sugar treats can tide your child over until mealtime or serve as a stand-in for dessert.
• Something to drink.
  Make it 100 percent juice or flavored water, a yogurt drink, or, on a hot day, an energy drink such as Gatorade.
• Avoid peanuts, raisins, and uncut grapes for children under age 4 because they are choking hazards.

Source: Woman's Day Magazine