If your baby has phlegm and can’t cough it up, the common methods are as follows: 1. First of all, you should give your baby more water, because in case of insufficient water, the phlegm will be sticky and difficult to cough up. 2. In addition, you should pat your baby’s back more often, from bottom to top with hollow palms on both sides of the spine, each time the strength should be moderate, too light can’t play the role of phlegm discharge, you can pat it several times a day, which will help promote the baby’s phlegm discharge. But after all, the baby’s respiratory muscle strength is relatively weak, and if there is a lot of phlegm is more difficult to cough out. 3, if there is a lot of phlegm can be nebulized, after nebulization phlegm will be diluted, can also help phlegm elimination. 4, if there is really a lot of phlegm, should be under the guidance of the doctor, whether to carry out suction treatment. The above questions are for reference only, please refer to the doctor’s guidance for specific medication and treatment.