Children need the calcium equivalent of at least 3 glasses of milk a day. If they are not consuming that much, then look for ways to sneak calcium-rich foods into the daily diet. Cook hot cereal in milk instead of water, add nonfat dry milk powder to cookie or muffin batter, and make fruit and milk smoothies. Mission Life Balance tortillas have the calcium and vitamin D equivalent of a glass of milk in each tortilla, so a chicken and black bean burrito made with one of those tortillas also is a great way to increase calcium intake.