My son has been diagnosed with the early stages of pneumonia and asthma. We've been told to use Asthalene and Budocret inhalers for him. Is it safe for a 4-year-old to use these inhalers? How long do you think he'll need to use them for his condition to improve? He's also currently taking Montair 5 mg and Zecom syrup. Would love some guidance on this.