For the symptoms of cough and phlegm in 13-year-old children, you can take the following medicines to relieve: 1, give children Jin Zhen oral liquid, Jin Zhen oral liquid ingredients include Pingbeimu and so on, can play a good role in clearing away heat and resolving phlegm, suitable for children’s cough and phlegm, and phlegm is very yellow, the children’s mouth and lips are red, the bowel is dry. 2, give children cephalosporin, if children not only have a cough, phlegm, but also If the child not only has a cough and phlegm, but also has fever and a very high white blood cell count, it is considered to be caused by a bacterial infection, and cephalosporins such as cefaclor or cefixime can be applied promptly to treat it.