What is healthy food for children?

I am not an expert in nutrition, nor do I pretend to know all the right food combinations. Still, it is important to offer my children a balanced diet for 2 main reasons: 1/ strengthen their health and offer them premises for correct development; 2/ nurture their appetite for a healthy life style

I found a very interesting article about nutrition for children and teens, which I highly recommend you to read.
For me it was of most interest the below table for school age children:

Dietary guidelines for school age children
Vegetables	3-5 servings per day. A serving might be one cup of raw leafy vegetables, 3/4 cup of vegetable juice, or 1/2 cup of other vegetables, raw or cooked.
Fruits	2-4 servings per day. A serving may consist of 1/2 cup of sliced fruit, 3/4 cup of fruit juice, or a medium-size whole fruit, such as an apple, banana or pear.
Whole Grains	6-11 servings per day. Each serving should equal one slice of bread, 1/2 cup of rice or 1 ounce of cereal.
Protein	2-3 servings of 2-3 ounces of cooked lean meat, poultry, or fish per day. A serving in this group may also consist of 1/2 cup of cooked dry beans, one egg, or 2 tablespoons of peanut butter for each ounce of lean meat.
Dairy products	2-3 servings (cups) per day of low-fat milk or yogurt, or natural cheese (1.5 ounces=one serving).
Zinc	Studies indicate that zinc may improve memory and school performance, especially in boys. Good sources of zinc are oysters, beef, pork, liver, dried beans and peas, whole grains, fortified cereals, nuts, milk, cocoa, and poultry.

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You can read the whole article at http://www.helpguide.org/life/healthy_eating_children_teens.htm