Babies often have respiratory illnesses, and many doctors recommend “nebulization” for coughing, phlegm, and edema in the throat, so is nebulization harmful to babies? With the progress of medicine over the years, and through the experience of many children, nebulization is now considered to be the most effective and direct treatment method with the best effect and the least side effects. The reasoning is different from that of taking medication. The medication taken into the stomach needs to go through the blood circulation of the whole body and part of it reaches the lungs to take effect, and the time to take effect is bound to be slower than that of nebulized inhalation into the lungs, in addition, the medication that reaches the liver and kidneys at the same time will have side effects for the baby, so nebulized inhalation will also avoid damage to the baby’s delicate liver and kidneys. Nebulized drugs will enter the body with the respiratory airflow and directly contact with the mucous membrane epithelium on the airway surface to exert drug effects, with strong local effects and high local drug concentration, and good efficacy. It can accurately act on the diseased lungs and airways, so the drug effect is fast and good. Moreover, since the dose of medicine is small because it is localized, it is a treatment method that many pediatricians are happy to use. Nebulization is more effective, uses less medication, and has fewer side effects, making it safer than oral medication and infusions.