1.According to ur breif history, your child is having having simple Upper respiratory infection. 2.Try some decongestant like Wickoryl drops . Or Nasal drops like nasivion. 3.Did doctor prescribed nebulizer or have you Consulted for Same?.it will have its own complications. 4.For all cold and cough , No need of nebulization. 5.Use it judiciously.

Try to use nasal saline drops. It will clear secreations. No need of nebulisations unnecessary.