Children with phlegm can not cough up may be related to the cough reflex has not yet been fully established, phlegm is thicker, phlegm exists in deeper parts, etc., can help children through the clap phlegm, drink more warm water, Ambroxol nebulizer inhalation medication to help the child to expel phlegm. 1. Cough reflex is not yet fully established: As children are still in the process of growth and development, the cough reflex may not yet be fully established, and the power of independent coughing is weak, which may result in phlegm coughing up phenomenon. Parents can help their children to expel phlegm by gently patting their backs from bottom to top to vibrate the phlegm in the respiratory tract. 2. Sticky phlegm: When the environment in which the child is located is too dry, due to the increasing secretion of respiratory tract inflammation, it will lead to sticky phlegm, which is not easy to discharge, at this time, parents can let the child drink a small amount of lukewarm water to moisten the pharynx, so as to make the phlegm easy to discharge. And pay attention to maintain the temperature and humidity of the indoor air. 3. Phlegm exists in a deeper part: when a child has phlegm to cough up, it may be caused by the phlegm exists in a deeper part. At this time, parents should take their children to the regular hospital for consultation, under the guidance of the doctor to use saline nebulizer inhalation to dilute phlegm, can also be taken orally to dilute the phlegm of aminobromine hydrochloride oral solution, aminobromoterol oral solution and other medications to promote phlegm discharges. There are many reasons why children can’t cough up phlegm, so parents should bring their children to the doctor in time to have the cause clarified by a professional doctor for treatment. All of the above drugs should be used under the guidance of a doctor, avoid self-medication.