Yes, there is phlegm in children's throat, which indicates that lung fire is vigorous, and rock sugar Sydney soup is suitable for regulating symptoms such as phlegm and dampness in lungs and upper respiratory tract caused by lung fire. Of course, children with phlegm may also be infected with the upper respiratory tract. If the child has no symptoms such as cough, fever and stuffy nose for the time being, he can take rock sugar Sydney soup, Shizi Yinqiao powder and other conditioning.