Hello doctor, my son is falling sick often and not eating food enough. please advise what can be done to improve immunity

A. give immunity booster food substance like-Eggs, youghrt, spinach, nuts like almond, oranges,, wallnut, sunflower seeds, apple, and all seasonal fruits and vegetables and , oats, garlic, carrot, broccoli, butter, beans , mint juice, milk and milk products.. Maintain proper hygine and educated your kid for proper hand washing.