My grandson has recurring cold and cough sometimes with fever since june.Since he throws up often milk has been stopped and soya milk from a tetra pack is given in the ratio of 100 ml diluted with 100 ml water 3 times a day.He has an egg ,a couple of cookies ,raw vegatables ...actually very little to eat though he loves food.He was just treated with augmentin ,emeset ,nasavion nose drops and tri minic syrup on the 2 of august 2013 til 7 august .Again he has cold and cough.His weight gain was great earlier.now it reduced by 500 gms and is stagnant since April.He is 1 year and 8 months old now,active but cranky during nights.pl advise.why does he get ill is it because of low immunity/?n is this soya providing nutrition?