I am really worried that your child is suffering from breathing problem at night.
Breathing difficulty at night suggest obstruction in nose which might be due to,
1. Adenoids (Tonsils behind nose) which can cause obstruction
2. Nasal obstruction
due to allergic rhinitis
which can result in cough.
3. Long term use of oxymetazoline
nasal drops resulting in turbinate hypertrophy.
Since there are multiple causes for nasal obstruction, it is always nice to get an opinion from ENT specialist
. You have done the right thing by getting an appointment from ENT specialist. He will be alright, take care.
Dr Balaji C