Warm liquids soothe the throat and nasal passages, so brew a pot of herbal tea for your child. (Sweeten, if necessary, with a natural sweetener such as agave nectar or stevia.) Your natural products store likely carries several teas created specifically for allergy and sinus sufferers. The Art of Health’s Allergy Clearing Tea contains anti-inflammatory herbs licorice and rose hips, as well as detoxifiers including nettle and red clover to help calm inflammation and provide symptom relief.