In order to rid your child of a nasty cough, you'll need to get your hands on some raw, dark amber honey, such as buckwheat honey, avocado honey or blackberry honey. However, make sure never to give honey to a child who is under a year old.
You can try brewing a honey, lemon and ginger tea to calm a cough and soothe a sore throat at once. Honey will break up mucus, and the astringent nature of lemon juice will do the same thing while also providing your child with a healthy dose of vitamin C.