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The U.S. Department of Agriculture recommends children ages 9 and older and adults consume at least 3 cups from the dairy group each day. Active teenagers with high calorie requirements of 3,000 calories or more may require 4 cups from the dairy group each day.
It's still two servings a day for kids under 4. (For kids 9 to 18, it's four servings.) One cup of milk or yogurt or 1.5 ounces of cheese (equivalent to six dice-size cubes) counts as a serving. But keep in mind that all dairy products are not created equal.