Hearing grrr grrr sounds for a month now... feels congestion from nose to throat..  his chest is clear(doctor said) hearing it more while breastfeeding him and sleeping.. while sleeping , he is breathing with mouth and snoring sound is also there. All of this started on September 11th with cough and cold with this nasal block .. he got viral fever after that instance which lasted for a week. After viral fever gone again he got cold and cough .. runny nose mainly.. This nasal congestion is there since that time.. it came down a bit but again increased.. now cough cold is gone but still that congestion is there.. Medication: as prescribed by pediatrician we gave mucolite drops - 0.5 ml for 5 days and montair LC 2.5 ml for 5 days .. in the first instance.. Second instance: same repeated for another 5 days .. .yesterday again due to this congestion met another pediatrician who asked us to start with monzet 4 ml for 10-15 days and mucolite 1 ml twice daily for 3 days. is it safe to give?