No, not always dry cough turns into wet. In some cases, it can also pass by itself. The most common cause of a dry, tiring cough in a child is usually the onset of a respiratory infection, then over time it will turn into a wet cough (as the infection develops). A fairly common complaint in children is a dry cough that persists after bronchitis, cold, flu or other respiratory infection. This is called post-infectious cough, which results from damage to the epithelium in the respiratory tract, which causes temporary bronchial hyperreactivity. Post-infectious cough can persist for up to several weeks after the end of the infection. Cough stimulator can also be factors such as tobacco smoke, dust, allergens, parasites, household chemicals, cold or hot air. I enclose materials that may be interesting and information about the possibility of using teleconsultation: https://www.gdziepolek.pl/artykuly/kaszel-suchy-i-mokry-jak-go-leczyc