According to the goverment guidance:
Children need to be given a balanced of certain foods in order to grow and function properly.
Below are the nutrients needed for healthy eating
Basic children's nutrition
Grains. Grains and starches should form the basis of healthful diet. Offer your child whole grains that are also iron fortified, such as whole-wheat bread and pasta, oatmeal and enriched breakfast cereals. Your child should eat 6 servings (at least 3 from whole grain foods) from this group daily.
Fruits and veggies. Keep plenty of fresh, frozen, canned, and dried fruits on hand but go easy on fruit juice (one serving daily, or 3/4 cup of 100% fruit juice is enough). Vegetables with strong flavors, such as broccoli or Brussels sprouts, are disliked by most children. They enjoy mild-flavored vegetables, such as sweet potatoes, green beans and cooked carrots. Remember to think bright colors for vegetables for their vitamin A content. Aim for 2 servings of fruits and 3 servings of vegetables daily. Try serving a fruit with each meal and a vegetable with lunch and dinner. Children also enjoy finger foods; so try cutting up strawberries, melons, tomatoes and sweet peppers for 'handy' treats. Children should eat five fruit and vegetables a day, in accordance with the government guidelines.
Dairy. Calcium-rich foods are essential for children and adults to build strong bones. Serve low fat (1%) and fat-free dairy products several times a day. Do not restrict fat until after the age of two. Choose cheeses with 2-6 grams of fat per ounce. Other kid-friendly sources of calcium that fall outside of the dairy group include calcium-fortified orange juice and waffles.
• Protein. Protein is essential for growing tissues but is abundant in the American diet, so deficiencies are rare. Serve your family lean meat, chicken, turkey and fish, or dry beans and peas. Your child should consume the equivalent of 6 ounces of meat daily. Peanut butter and eggs count as meat substitutes and are protein-rich. Encourage you child to eat 2 servings each from the milk and meat food groups.
Sugars. If your child's diet is healthy, one daily sweet is fine. Added sugars contribute calories with few nutrients. Check ingredients on nutrition labels. If sugar is listed as one of the first four ingredients, eat that food in moderation. Good dessert choices include angel food cake, frozen yogurt, animal crackers, 100% frozen fruit bars, and vanilla wafers. We all need some healthy fats in the diet. Be sure your child gets most of his/her fats from fish, nuts, and liquid oils such as corn, soybean, canola and olive oil.
Liquids. Offer your child water and nonfat or 1% milk in place of high-calorie, sugary drinks.
Hope this helps.
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Level 3 handbooks on amazon.o.uk
Vegetarian children
http://www.naturalhydrationcouncil.org.uk/
First foods - NHS Sotland
Nutrition matters from healthy promotion agency