Here are some snack ideas:
Low-sugar, whole-grain breakfast cereal with milk
Mix dry cereal with nuts, raisins and/or a few chocolate chips
String cheese, low-sugar yogurt, cottage cheese
Nuts and raisins
Cut-up veggies and hummus
Whole-grain pretzels
Fruit plain or dipped in low-fat flavored yogurt
Popcorn
Unsweetened fruit cups.