Hello Doctors and experience mothers,my son is 8 months old,and he has allergic cold issues since he was 5 months old,so he easily get cold and most of the time dry cold,no cough,but his chest makes sound like cough,i had visit Many times to the doctor because of his chest sounds,i thought it was cough,but his doctor said no its because of his nose is blocked and he had cold thats for the reason of that sound,because of his allergic issues i am not outside avoiding many things as can possible,still many times he get cold,now his chest again sounds like grrrrr like a cough,but he is not coughing,just sneezing,please tell me what can k do for avoiding his allergic cold,and this chest sound,please reply 🙏🏻