The child’s breathing sound is heavy, consider that it may be related to the narrowing of the airway, nasal infection, obesity and other factors. 1. Narrowed airways: enlarged turbinates, enlarged adenoids and enlarged tonsils can lead to narrowed airways. When breathing, the airflow through the narrowed airway will emit a coarse breathing sound. 2. Nasal infection: Suffering from rhinitis, sinusitis and other diseases, nasal secretions increase can block the airway, resulting in heavy breathing. 3. Obesity: Obesity can lead to excessive accumulation of fat in the child’s neck, which may compress the respiratory tract and cause the child to breathe heavily. There may be other clinical causes of heavy breathing, it is recommended to take your child to the pediatrics or ENT department of the hospital to determine the cause of the problem.