You are consulting for reason of wellness.weight is up and down due repeated episodes of cold cough. Please consult pediatrician in person to fully examine and rule out any ailment. I am concerned regarding wellness.. To prevent frequent cold and cough: You use Indian herbs which are good and efficacious. Try 150ml of drinking water, + fresh ginger crushed  small piece+ Jaggary,+ 3 cloves,+3 whole black pepper,and boil to concentrate concocction to 100ml. Cool it and serve warm. 2times a day.for 3-4 days.  Nutritious diet with lots of antioxidants and mi neral, and vitamins. Enough proteins.1gm per kg weight.  This does help in curtailing frequent URTI.Exercises to boost immunity and circulation of blood to all system. Provide positive healthy emotional welbeing. Never shout or abuse or argue in presence of your child. They come up various behavior problems and immunity development. Immunization helps you to provide specific immunity.  That is all I can say. Add Vit A syrup 1ml one dose, vit C 500 iu chewable tab of and on in place of candy. Food should be home made fresh free from additives or processing. Happiness atmosphere is best antidote to all ailments. Pl change the life style including thinking simple.