Since the swallowing function of babies is not fully developed, it is easy to have phlegm in the throat after a cold or upper respiratory infection, and it will make a whirring sound with breathing. In this case parents can give medication, use physical methods and other measures to help the baby to expel the phlegm. The baby’s throat phlegm whirring and inflammatory infection has a great relationship, so the treatment to anti-infection and lung cough mainly, consider bacterial infection can be combined with antibiotics together with treatment, consider mycoplasma infection can be combined with macrolide antibiotics will be more effective. The drugs for phlegm can be Chuanbei cough syrup, Ambroxol and other drugs. When the inflammation is under control, the secretion in the throat will be reduced accordingly, and the amount of phlegm will also be reduced, so the sound of the baby’s throat whistling will disappear accordingly. If necessary, you can also give your baby nebulization treatment, nebulization treatment drugs can directly reach the lesion, play a better treatment effect. Normally, you should give your baby more plain water to help moisten the baby’s throat, dilute the phlegm, and facilitate the discharge of phlegm. You can reasonably use humidifier in the room to make the air more moist, avoid dryness and reduce the symptoms of phlegm in the throat.