Thank you for your query on Healthcare Magic.
Your child seems having an viral fever
You can give Tylenol if there is a low grade fever
If there is a nose block, you can put the nasal saline drops 1 or 2 into nostrils to clear the airways.
But if there is respiratory difficulty even after clearing the airways I advise you to consult ER for the assessment of respiratory system to rule out any lower respiratory tract
infection like pneumonia
Hope I have answered your query.