It is best not to eat fish when children have a cold and cough. Clinically, it is not recommended to take fish orally because the immune function is relatively poor during a child’s cold and cough. Allergic reactions. If you have an allergic reaction to fish when you have a cold and cough, it may lead to an aggravation of the symptoms of the cold and cough, or a cough and wheezing, and if the cough is aggravated and the wheezing is aggravated, it may lead to pneumonia and other unnecessary troubles. It is also recommended to drink more water and get enough sleep to help the recovery of the disease.