Toddler coughs

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My poor girl has had a cough for around 3/4 weeks now and each time I take her to the doctor they say her chest is clear and there are no signs of any wheezing or any shortness of breath etc. I’ve tried so many things to help ease it, it’s worse at night. I’ve tried vapour rub on the soles of her feet, humidifier in her room, honey and lemon drinks,the doctor gave me a asthma inhaler for her to try and still nothing seems to work. Has anyone dealt with this or has any tips?