Babies with bronchial phlegm are not able to actively cough up phlegm because their respiratory system is not well developed, which can easily aggravate inflammation and even cause pneumonia. You can pat the baby’s back from bottom to top with a hollow palm to vibrate the secretions in the lungs and promote the baby’s phlegm discharge. You can drink a little warm boiled water and warm juice appropriately to dilute the phlegm. You can also give your baby appropriate nebulizer inhalation treatment, such as choosing budesonide nebulizer, chymotrypsin nebulizer, to dilute sputum and promote the discharge of sputum.