When he is ill, your child may have poor appetite or be unable to take his regular foods. You need to do your best to maintain his nourishmen

Give your child a soft diet that is easy to swallow and digest, like bread with a little jam or rice porridge. Avoid fatty or too much complex carbohydrate foods.

Provided your child’s infection does not affect his/her digestive system (and cause diarrhoea or vomiting), you can maintain his/her intake of protein, vitamins and minerals by giving foods like milk and fruits. Some creativity (eg using milk in desserts or fruits asjuices or in jelly) goes a long way in nourishing a sick child.You can also give the child yogurt to provide friendly bacteria (probiotics) to help with the healing process and provide nutrition.

When the child is sick you must need to increase fluid intake like encouraging your child to drink more water and also fresh fruit juices. At the same time you must not give your child fatty foods and increased fibers in the diet is also needed. But giving foods may depends on what sickness the child have. It really varies but as long as you would increased the fluid intake of the child then it would be much better.