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Drink tea. Hot liquids in general help to dissolve the mucus that causes chest congestion, but tea offers a double punch by adding in helpful herbs and spices that can ease chest pain and congestion. Brew up a cup of peppermint, ginger, chamomile, rosemary, or ginseng tea to drink several times a day.
Diffusing Marjoram is said to break up congestion. Using a blend of Rosemary, Lemon, Peppermint, Clove, Eucalyptus and Melaleuca can help decongest and soothe-Find this blend HERE. I recommend diluting essential oils with a carrier oil like coconut oil or olive oil. You can rub their back and chest with this blend.