Hi I m writing regarding my son aged 3 yrs 3 months. A year ago when on holiday he was hospitalized due to a stomach infection & his weight dropped to a 9 kgs. Since then he hasn t seemed to have passed 13kgs in weight & he is also undersized when compared to his birthweight & height. He has allergies to quite a few foods & has been advised to avoid cold foods like yogurt , cheese as it creates mucous in the chest & he falls sick easily. At this age are children to take multivitamins? I was also trying to find out the side effects of Mucolyte as he has recently been prescribed the same & today ( the 3rd day of his medication) he woke up with rashes on his cheeks. He has for the last 4 days been having an upset stomach & complains whenever he consumes milk based foods. I am quite concerned about him not having a normal growth. Would appreciate your advice on the above.