My remark: never use eucalyptus for small children
Eucalyptus oil not only helps see off bacterial and viral infections, but also soothes irritated mucous membranes and helps expel mucus. You can use dried eucalyptus leaves to make a tea effective for both acute and chronic bronchitis. Put 3–4 dried leaves in a pan, add a cupful of cold water, bring to the boil and simmer for a minute, then take off the heat, cover and let it steep for ten minutes.
Strain, add a little honey and drink hot two to three times a day.