<s>[INST] my daughter get infected after every third week coughing chest infections fever etc. As suggested by the pedestrian chest X ray & montoux were examined & found normal all this is happening from last three years. Now she is 6 year old weighting 16 kg. & born as a pre -mature baby. [/INST] There are other reasons for repeated chest infection or repeated chest symptoms, first we have to establish whether it is infection or not. It could be allergy, like asthma. Do you have a family history of asthma or hay fever? Was she ever suggested inhalers by doctor? Did it help? It is better to get a diagnosis before starting any medication. Consult a baby doctor and get diagnosis. Other problems could be foreign body or cystic fibrosis. </s>