When children catch a cold and cough with phlegm, the first consideration should be whether there is bronchitis. If the cough is severe, expectorant and cough suppressing medications can be administered orally, such as traditional Chinese medicine or Western medicine, for example, ambroxol. Additionally, bronchitis might be accompanied by a bacterial infection, in which case anti-inflammatory drugs like cephalosporins or penicillin can be prescribed. Nebulizer treatment can also be used, which helps in thinning the mucus and suppressing cough. Furthermore, it might be necessary to conduct a routine blood test to assess the child's condition.