Hi... Swine flu is a infection that spreads by drop let infection that is by coughing and sneezing. Hence i will suggest you to wear a mask when you go around in a crowded place. There are special masks that have been designed for prevention of swine flu... Wash your hand frequently.... Avoid exposure to people who are having flu symptoms... Healthy and nutritious diet will help boost immunity toward the infection.. There are influenza vaccines available in few countries, you may think of vaccinating your kid if he has not recieved one, probably after consulting your doctor....