Hello everyone! I have a 4-month-old baby, when I was not at home, the…

Hello everyone! I have a 4-month-old baby, when I was not at home, the children opened the window a little and there was a draft, and already on the next day my daughter started coughing ??‍♀️ How can you treat her? She is still so small, only 4 months old, please advise if it's necessary to call a doctor and how to treat it, there is a slight cough but I am still worried, share your experience, I will wait for your reply. And one more thing, can you use Cefiron candles?