Hello. As per the age of the child, he is underweight. Please add calorie rich diet. A detailed diet chart to be maintained as per likes and dislikes of the child. Please describe any sort of allergies that the child possesses. Milk based diet-paneer/ghee/butter milk should be encouraged Colourful diet plate to be made with green vegetables/ carrots/ pulses to be given Fruits and fibres to be increased. Syp Zincovit to be given 1 tsp per day

Yes, can - 5 ml once daily

Give food rich in vitamin A and C. Give plenty of green vegetables. Its better to give fod than giving any supplements. You may give syp zincovit 5ml twice daily

Give him rich protein  foods  like  egg ,fish ,ghee  ect. And fruits . To prevent recurrent cold, give  him Syr. Septilin 5 ml daily once for 3 months. Continue  Syr. Zincovit  5 ml daily  once..