my child is 5 yr 3 months old .he is very thin and frequently suffer from cold .his wt is 15.3 kg. please let me know how to increase his wt and immunity

A. Give all kind of healthy foods to the child fruits vegetables basic home-made diet is good you just need to avoid giving junk food and outside food and also sugary food that’s more than enough if you maintain a good healthy diet the immunity would be better over the period